The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form
Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scatterin...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
de Oliveira, Lilian R. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017transfer abstract |
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| Schlagwörter: |
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| Umfang: |
11 |
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| Übergeordnetes Werk: |
Enthalten in: Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies - Ali, Imran ELSEVIER, 2017, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:1128 ; year:2017 ; day:15 ; month:01 ; pages:707-717 ; extent:11 |
| Links: |
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| DOI / URN: |
10.1016/j.molstruc.2016.09.044 |
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ELV015557138 |
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| 245 | 1 | 4 | |a The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form |
| 264 | 1 | |c 2017transfer abstract | |
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| 520 | |a Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. | ||
| 520 | |a Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. | ||
| 650 | 7 | |a Heat treatment |2 Elsevier | |
| 650 | 7 | |a XRD |2 Elsevier | |
| 650 | 7 | |a Polyaniline |2 Elsevier | |
| 650 | 7 | |a Le Bail method |2 Elsevier | |
| 650 | 7 | |a SAXS |2 Elsevier | |
| 700 | 1 | |a Manzato, Lizandro |4 oth | |
| 700 | 1 | |a Mascarenhas, Yvonne P. |4 oth | |
| 700 | 1 | |a Sanches, Edgar A. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Ali, Imran ELSEVIER |t Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies |d 2017 |g New York, NY [u.a.] |w (DE-627)ELV005044758 |
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10.1016/j.molstruc.2016.09.044 doi GBVA2017022000001.pica (DE-627)ELV015557138 (ELSEVIER)S0022-2860(16)30971-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 540 VZ 35.21 bkl de Oliveira, Lilian R. verfasserin aut The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Heat treatment Elsevier XRD Elsevier Polyaniline Elsevier Le Bail method Elsevier SAXS Elsevier Manzato, Lizandro oth Mascarenhas, Yvonne P. oth Sanches, Edgar A. oth Enthalten in Elsevier Ali, Imran ELSEVIER Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies 2017 New York, NY [u.a.] (DE-627)ELV005044758 volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 https://doi.org/10.1016/j.molstruc.2016.09.044 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.21 Lösungen Flüssigkeiten Physikalische Chemie VZ AR 1128 2017 15 0115 707-717 11 045F 540 |
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10.1016/j.molstruc.2016.09.044 doi GBVA2017022000001.pica (DE-627)ELV015557138 (ELSEVIER)S0022-2860(16)30971-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 540 VZ 35.21 bkl de Oliveira, Lilian R. verfasserin aut The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Heat treatment Elsevier XRD Elsevier Polyaniline Elsevier Le Bail method Elsevier SAXS Elsevier Manzato, Lizandro oth Mascarenhas, Yvonne P. oth Sanches, Edgar A. oth Enthalten in Elsevier Ali, Imran ELSEVIER Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies 2017 New York, NY [u.a.] (DE-627)ELV005044758 volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 https://doi.org/10.1016/j.molstruc.2016.09.044 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.21 Lösungen Flüssigkeiten Physikalische Chemie VZ AR 1128 2017 15 0115 707-717 11 045F 540 |
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10.1016/j.molstruc.2016.09.044 doi GBVA2017022000001.pica (DE-627)ELV015557138 (ELSEVIER)S0022-2860(16)30971-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 540 VZ 35.21 bkl de Oliveira, Lilian R. verfasserin aut The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Heat treatment Elsevier XRD Elsevier Polyaniline Elsevier Le Bail method Elsevier SAXS Elsevier Manzato, Lizandro oth Mascarenhas, Yvonne P. oth Sanches, Edgar A. oth Enthalten in Elsevier Ali, Imran ELSEVIER Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies 2017 New York, NY [u.a.] (DE-627)ELV005044758 volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 https://doi.org/10.1016/j.molstruc.2016.09.044 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.21 Lösungen Flüssigkeiten Physikalische Chemie VZ AR 1128 2017 15 0115 707-717 11 045F 540 |
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10.1016/j.molstruc.2016.09.044 doi GBVA2017022000001.pica (DE-627)ELV015557138 (ELSEVIER)S0022-2860(16)30971-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 540 VZ 35.21 bkl de Oliveira, Lilian R. verfasserin aut The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Heat treatment Elsevier XRD Elsevier Polyaniline Elsevier Le Bail method Elsevier SAXS Elsevier Manzato, Lizandro oth Mascarenhas, Yvonne P. oth Sanches, Edgar A. oth Enthalten in Elsevier Ali, Imran ELSEVIER Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies 2017 New York, NY [u.a.] (DE-627)ELV005044758 volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 https://doi.org/10.1016/j.molstruc.2016.09.044 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.21 Lösungen Flüssigkeiten Physikalische Chemie VZ AR 1128 2017 15 0115 707-717 11 045F 540 |
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10.1016/j.molstruc.2016.09.044 doi GBVA2017022000001.pica (DE-627)ELV015557138 (ELSEVIER)S0022-2860(16)30971-1 DE-627 ger DE-627 rakwb eng 540 540 DE-600 540 VZ 35.21 bkl de Oliveira, Lilian R. verfasserin aut The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. Heat treatment Elsevier XRD Elsevier Polyaniline Elsevier Le Bail method Elsevier SAXS Elsevier Manzato, Lizandro oth Mascarenhas, Yvonne P. oth Sanches, Edgar A. oth Enthalten in Elsevier Ali, Imran ELSEVIER Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies 2017 New York, NY [u.a.] (DE-627)ELV005044758 volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 https://doi.org/10.1016/j.molstruc.2016.09.044 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.21 Lösungen Flüssigkeiten Physikalische Chemie VZ AR 1128 2017 15 0115 707-717 11 045F 540 |
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Enthalten in Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies New York, NY [u.a.] volume:1128 year:2017 day:15 month:01 pages:707-717 extent:11 |
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Artificial neural network modelling of amido black dye sorption on iron composite nano material: Kinetics and thermodynamics studies |
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influence of heat treatment on the semi-crystalline structure of polyaniline emeraldine-salt form |
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The influence of heat treatment on the semi-crystalline structure of polyaniline Emeraldine-salt form |
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Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. |
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Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. |
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Polyaniline emeraldine-salt form (PANI-ES) was chemically synthesized using hydrochloric acid and subjected to heat treatment for 1 h at 50, 100, 200 and 300 °C. X-ray Diffraction (XRD), Le Bail method structural refinement, Infrared-transform Fourier Spectroscopy (FTIR), Small-angle X-ray Scattering (SAXS), Scanning Electron Microscopy (SEM) and Electrical Conductivity measurements were used to evaluate the influence of heat treatment on the semi-crystalline structure of PANI. The heat treatment has resulted in a progressive decrease of crystallinity from 50 to 22%. A crosslinking process during heat treatment was observed by FTIR at 200 °C, revealing some chemical changes in molecular structure of PANI such as elimination of HCl on the imino groups and the simultaneous chlorination of the aromatic rings. Le Bail method showed that crystal structure of the unheated ES-PANI is strongly dependent on the molecular size of the counter ion, so the unit cell volume needed to be increased for their accommodation in the polymer structure. The refined parameters suggested a decomposition from tetrameric to dimeric-folded chains, accompanied by a decrease in the crystallite anisotropy and average size and shape, which reduced from 36 Å to 16 Å and acquired oblate shape. The pair-distance distribution function (p(r)) curves suggested particles tending from oblate to prolate form over heat treatment. Well-defined nanofibers were observed in unheated ES-PANI, which decreased and lost progressively their initial morphology over heat treatment. Electrical conductivity showed a decreasing of about 90% due to the loss of emeraldine sequences and removal of chloride ions. |
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