Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines
In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were pr...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Kobzar, Ya.L. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018transfer abstract |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study - Fitzgerald, Emily ELSEVIER, 2020, the international journal for the science and technology of polymers, Oxford |
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| Übergeordnetes Werk: |
volume:145 ; year:2018 ; day:6 ; month:06 ; pages:62-69 ; extent:8 |
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| DOI / URN: |
10.1016/j.polymer.2018.04.070 |
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| 245 | 1 | 0 | |a Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines |
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| 520 | |a In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. | ||
| 520 | |a In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. | ||
| 650 | 7 | |a Dielectric constant |2 Elsevier | |
| 650 | 7 | |a Highly cross-linked resins |2 Elsevier | |
| 650 | 7 | |a Fluorinated polybenzoxazine |2 Elsevier | |
| 650 | 7 | |a Polybenzoxazine |2 Elsevier | |
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| 700 | 1 | |a Bliznyuk, V.N. |4 oth | |
| 700 | 1 | |a Lobko, E.V. |4 oth | |
| 700 | 1 | |a Shekera, O.V. |4 oth | |
| 700 | 1 | |a Shevchenko, V.V. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Fitzgerald, Emily ELSEVIER |t Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study |d 2020 |d the international journal for the science and technology of polymers |g Oxford |w (DE-627)ELV005093368 |
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10.1016/j.polymer.2018.04.070 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001022.pica (DE-627)ELV043206360 (ELSEVIER)S0032-3861(18)30376-8 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl 44.69 bkl Kobzar, Ya.L. verfasserin aut Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. Dielectric constant Elsevier Highly cross-linked resins Elsevier Fluorinated polybenzoxazine Elsevier Polybenzoxazine Elsevier Tkachenko, I.M. oth Bliznyuk, V.N. oth Lobko, E.V. oth Shekera, O.V. oth Shevchenko, V.V. oth Enthalten in Elsevier Science Fitzgerald, Emily ELSEVIER Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study 2020 the international journal for the science and technology of polymers Oxford (DE-627)ELV005093368 volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 https://doi.org/10.1016/j.polymer.2018.04.070 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ 44.69 Intensivmedizin VZ AR 145 2018 6 0606 62-69 8 |
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10.1016/j.polymer.2018.04.070 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001022.pica (DE-627)ELV043206360 (ELSEVIER)S0032-3861(18)30376-8 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl 44.69 bkl Kobzar, Ya.L. verfasserin aut Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. Dielectric constant Elsevier Highly cross-linked resins Elsevier Fluorinated polybenzoxazine Elsevier Polybenzoxazine Elsevier Tkachenko, I.M. oth Bliznyuk, V.N. oth Lobko, E.V. oth Shekera, O.V. oth Shevchenko, V.V. oth Enthalten in Elsevier Science Fitzgerald, Emily ELSEVIER Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study 2020 the international journal for the science and technology of polymers Oxford (DE-627)ELV005093368 volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 https://doi.org/10.1016/j.polymer.2018.04.070 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ 44.69 Intensivmedizin VZ AR 145 2018 6 0606 62-69 8 |
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10.1016/j.polymer.2018.04.070 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001022.pica (DE-627)ELV043206360 (ELSEVIER)S0032-3861(18)30376-8 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl 44.69 bkl Kobzar, Ya.L. verfasserin aut Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. Dielectric constant Elsevier Highly cross-linked resins Elsevier Fluorinated polybenzoxazine Elsevier Polybenzoxazine Elsevier Tkachenko, I.M. oth Bliznyuk, V.N. oth Lobko, E.V. oth Shekera, O.V. oth Shevchenko, V.V. oth Enthalten in Elsevier Science Fitzgerald, Emily ELSEVIER Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study 2020 the international journal for the science and technology of polymers Oxford (DE-627)ELV005093368 volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 https://doi.org/10.1016/j.polymer.2018.04.070 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ 44.69 Intensivmedizin VZ AR 145 2018 6 0606 62-69 8 |
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10.1016/j.polymer.2018.04.070 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001022.pica (DE-627)ELV043206360 (ELSEVIER)S0032-3861(18)30376-8 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl 44.69 bkl Kobzar, Ya.L. verfasserin aut Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. Dielectric constant Elsevier Highly cross-linked resins Elsevier Fluorinated polybenzoxazine Elsevier Polybenzoxazine Elsevier Tkachenko, I.M. oth Bliznyuk, V.N. oth Lobko, E.V. oth Shekera, O.V. oth Shevchenko, V.V. oth Enthalten in Elsevier Science Fitzgerald, Emily ELSEVIER Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study 2020 the international journal for the science and technology of polymers Oxford (DE-627)ELV005093368 volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 https://doi.org/10.1016/j.polymer.2018.04.070 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ 44.69 Intensivmedizin VZ AR 145 2018 6 0606 62-69 8 |
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10.1016/j.polymer.2018.04.070 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001022.pica (DE-627)ELV043206360 (ELSEVIER)S0032-3861(18)30376-8 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl 44.69 bkl Kobzar, Ya.L. verfasserin aut Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines 2018transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. Dielectric constant Elsevier Highly cross-linked resins Elsevier Fluorinated polybenzoxazine Elsevier Polybenzoxazine Elsevier Tkachenko, I.M. oth Bliznyuk, V.N. oth Lobko, E.V. oth Shekera, O.V. oth Shevchenko, V.V. oth Enthalten in Elsevier Science Fitzgerald, Emily ELSEVIER Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study 2020 the international journal for the science and technology of polymers Oxford (DE-627)ELV005093368 volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 https://doi.org/10.1016/j.polymer.2018.04.070 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ 44.69 Intensivmedizin VZ AR 145 2018 6 0606 62-69 8 |
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Enthalten in Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study Oxford volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 |
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Enthalten in Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study Oxford volume:145 year:2018 day:6 month:06 pages:62-69 extent:8 |
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Functional outcomes at 12 months for patients with traumatic brain injury, intracerebral haemorrhage and subarachnoid haemorrhage treated in an Australian neurocritical care unit: A prospective cohort study |
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Synthesis and characterization of fluorinated isomeric polybenzoxazines from core-fluorinated diamine-based benzoxazines |
| abstract |
In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. |
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In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. |
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In this work, we describe the design and synthesis of novel isomeric (para- and meta-) core-fluorinated polybenzoxazines from bis(benzoxazine)-containing monomers with 1,4-tetrafluorobenzene or 4,4′-octafluorobiphenylene dioxyphenylene central units. The new core-fluorinated polybenzoxazines were prepared as dimensionally stable free-standing films without loss of any useful properties. Thermal polymerization of benzoxazine monomers was analyzed using differential scanning calorimetry technique. Peculiarities of the polymerization behavior as well as thermal characteristics of the synthesized fluorinated polybenzoxazines could be related to the position of oxazine ring in the benzoxazine monomer. Furthermore, the effect of the electronic character of the groups surrounding the oxazine ring on the ring-opening polymerization process has been studied. We show correlation between isomeric structure of the fluorinated polybenzoxazines and their physical properties. The resulting polymer films possess a set excellent characteristics including high thermal stability (up to 491 °C), hydrophobicity (water contact angles above 90°), moisture resistance (water uptake less than 1% under water environment for one week), low dielectric constants and loss factors (2.35–2.61 and 0.0071 to 0.0248 at 105 Hz, respectively). This makes the synthesized polymer resins attractive for microelectronics and many other emerging applications. |
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