Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method
We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation bet...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Salim, Nisa V. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018transfer abstract |
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| Schlagwörter: |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS - Marx, Katherine A. ELSEVIER, 2016, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:67 ; year:2018 ; pages:151-158 ; extent:8 |
| Links: |
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| DOI / URN: |
10.1016/j.polymertesting.2018.01.030 |
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| 520 | |a We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. | ||
| 520 | |a We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. | ||
| 650 | 7 | |a Polyacrylonitrile |2 Elsevier | |
| 650 | 7 | |a Porosity |2 Elsevier | |
| 650 | 7 | |a Wet spinning |2 Elsevier | |
| 650 | 7 | |a Coagulation bath |2 Elsevier | |
| 650 | 7 | |a Carbon fiber |2 Elsevier | |
| 700 | 1 | |a Edrington, Sarah E. |4 oth | |
| 700 | 1 | |a Morris, E. Ashley |4 oth | |
| 700 | 1 | |a Weisenberger, Matthew C. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Marx, Katherine A. ELSEVIER |t USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS |d 2016 |g Amsterdam [u.a.] |w (DE-627)ELV013776983 |
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10.1016/j.polymertesting.2018.01.030 doi GBV00000000000213A.pica (DE-627)ELV042836654 (ELSEVIER)S0142-9418(17)31897-4 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 530 VZ 52.56 bkl Salim, Nisa V. verfasserin aut Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. Polyacrylonitrile Elsevier Porosity Elsevier Wet spinning Elsevier Coagulation bath Elsevier Carbon fiber Elsevier Edrington, Sarah E. oth Morris, E. Ashley oth Weisenberger, Matthew C. oth Enthalten in Elsevier Science Marx, Katherine A. ELSEVIER USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS 2016 Amsterdam [u.a.] (DE-627)ELV013776983 volume:67 year:2018 pages:151-158 extent:8 https://doi.org/10.1016/j.polymertesting.2018.01.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 52.56 Regenerative Energieformen alternative Energieformen VZ AR 67 2018 151-158 8 045F 540 |
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10.1016/j.polymertesting.2018.01.030 doi GBV00000000000213A.pica (DE-627)ELV042836654 (ELSEVIER)S0142-9418(17)31897-4 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 530 VZ 52.56 bkl Salim, Nisa V. verfasserin aut Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. Polyacrylonitrile Elsevier Porosity Elsevier Wet spinning Elsevier Coagulation bath Elsevier Carbon fiber Elsevier Edrington, Sarah E. oth Morris, E. Ashley oth Weisenberger, Matthew C. oth Enthalten in Elsevier Science Marx, Katherine A. ELSEVIER USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS 2016 Amsterdam [u.a.] (DE-627)ELV013776983 volume:67 year:2018 pages:151-158 extent:8 https://doi.org/10.1016/j.polymertesting.2018.01.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 52.56 Regenerative Energieformen alternative Energieformen VZ AR 67 2018 151-158 8 045F 540 |
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10.1016/j.polymertesting.2018.01.030 doi GBV00000000000213A.pica (DE-627)ELV042836654 (ELSEVIER)S0142-9418(17)31897-4 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 530 VZ 52.56 bkl Salim, Nisa V. verfasserin aut Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. Polyacrylonitrile Elsevier Porosity Elsevier Wet spinning Elsevier Coagulation bath Elsevier Carbon fiber Elsevier Edrington, Sarah E. oth Morris, E. Ashley oth Weisenberger, Matthew C. oth Enthalten in Elsevier Science Marx, Katherine A. ELSEVIER USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS 2016 Amsterdam [u.a.] (DE-627)ELV013776983 volume:67 year:2018 pages:151-158 extent:8 https://doi.org/10.1016/j.polymertesting.2018.01.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 52.56 Regenerative Energieformen alternative Energieformen VZ AR 67 2018 151-158 8 045F 540 |
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10.1016/j.polymertesting.2018.01.030 doi GBV00000000000213A.pica (DE-627)ELV042836654 (ELSEVIER)S0142-9418(17)31897-4 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 530 VZ 52.56 bkl Salim, Nisa V. verfasserin aut Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. Polyacrylonitrile Elsevier Porosity Elsevier Wet spinning Elsevier Coagulation bath Elsevier Carbon fiber Elsevier Edrington, Sarah E. oth Morris, E. Ashley oth Weisenberger, Matthew C. oth Enthalten in Elsevier Science Marx, Katherine A. ELSEVIER USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS 2016 Amsterdam [u.a.] (DE-627)ELV013776983 volume:67 year:2018 pages:151-158 extent:8 https://doi.org/10.1016/j.polymertesting.2018.01.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 52.56 Regenerative Energieformen alternative Energieformen VZ AR 67 2018 151-158 8 045F 540 |
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10.1016/j.polymertesting.2018.01.030 doi GBV00000000000213A.pica (DE-627)ELV042836654 (ELSEVIER)S0142-9418(17)31897-4 DE-627 ger DE-627 rakwb eng 540 540 DE-600 610 VZ 530 VZ 52.56 bkl Salim, Nisa V. verfasserin aut Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. Polyacrylonitrile Elsevier Porosity Elsevier Wet spinning Elsevier Coagulation bath Elsevier Carbon fiber Elsevier Edrington, Sarah E. oth Morris, E. Ashley oth Weisenberger, Matthew C. oth Enthalten in Elsevier Science Marx, Katherine A. ELSEVIER USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS 2016 Amsterdam [u.a.] (DE-627)ELV013776983 volume:67 year:2018 pages:151-158 extent:8 https://doi.org/10.1016/j.polymertesting.2018.01.030 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 52.56 Regenerative Energieformen alternative Energieformen VZ AR 67 2018 151-158 8 045F 540 |
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Enthalten in USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS Amsterdam [u.a.] volume:67 year:2018 pages:151-158 extent:8 |
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USE OF NOVEL OBSERVATIONAL METHODOLOGY FOR MEASURING AFFECT AND BEHAVIORS IN A BEHAVIORAL INTERVENTION FOR PERSONS WITH DEMENTIA HOSPITALIZED FOR BEHAVIORAL SYMPTOMS |
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analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method |
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Analyses of closed porosity of carbon fiber precursors using a robust thermoporosimetric method |
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We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. |
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We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. |
| abstract_unstemmed |
We investigated a major fiber spinning process parameter, the coagulation bath concentration, which has a critical effect on the porosity of the polyacrylonitrile (PAN) fibers. Utilizing thermoporosimetry, a calorimetric method based on the Gibbs–Thomson effect, this work details the correlation between coagulation bath concentration, porosity and pore size distribution. Pore size, as well as the pore size distribution, of the fibers throughout the wet spinning process were determined in detail. Moreover, the changes in the number of porous zones, pore size and fiber morphology during the wet spinning process were also examined by changing the coagulation bath composition. Two coagulation bath compositions, 77.5 wt% and 80 wt% DMAc/deionized water were considered. The fibers spun at 80 wt% coagulation bath solvent concentration displayed skinless rough surfaces with high porosity values compared to the fibers spun at 77.5 wt%. Attempts to spin into slightly more concentrated DMAc baths were unstable due to reduced tow tenacity, leading to fiber failure. The study showed that even minor changes in the coagulation bath composition can have a pronounced effect on the fiber properties such as cross-sectional shape, the integrity of the external skin, and the number and size of pores. |
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