Thermo-oxidative stabilization of polyacrylonitrile-based copolymers with guanidinium itaconate
| Autor: | Amy Tucker, William Jacobs, Michele Astrove, Billy Harmon, Jeremy D. Moskowitz |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Exothermic reaction
Polymers and Plastics Chemistry Polyacrylonitrile Infrared spectroscopy 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Differential scanning calorimetry Mechanics of Materials Polymer chemistry Materials Chemistry Copolymer Itaconic acid Acrylonitrile 0210 nano-technology |
| Zdroj: | Polymer Degradation and Stability. 178:109198 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2020.109198 |
| Popis: | Thermo-oxidative stabilization of polyacrylonitrile (PAN) is a highly exothermic reaction that can be regulated through judicious addition of comonomers. Herein, guanidinium itaconate (GIA) was synthesized and copolymerized with acrylonitrile (AN) as a candidate for PAN-based carbon fiber precursors. P(AN-co-GIA) copolymers were compared to analogous itaconic acid (ITA)-containing PAN copolymers through Fourier-transform infrared spectroscopy and differential scanning calorimetry (DSC). The kinetic parameters of activation energy and pre-exponential factor were determined along with the cyclization index at given conditions. DSC analysis significantly indicates that P(AN-co-GIA) copolymers initiate stabilization at lower temperature and reduce exothermic heat flow by as much as 37% in air as compared to P(AN-co-ITA) copolymers. Further, the cyclization rate proceeds at faster kinetic rates for the GIA-containing copolymers, thereby providing opportunity for increased process speeds through oxidation of PAN-based precursors. |
| Databáze: | OpenAIRE |
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