文献类型：期刊文献

英文题名：Kinetic Analysis and Reaction Mechanism of Pa4 Thermal Degradation: Thermal Stability with Respect to Crystallinity

作者：Wang, Mingda[1,2,3]; Zhang, Yajing[1,2,3]; Zhan, Fangke[1,2,3]; Qiu, Yongjun[1,2,3]; Chen, Tao[2,3,4]; Zhao, Liming[1,2,3]

机构：[1] State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, 200237, China; [2] Key Laboratory of Bio-based Materials Engineering, China National Light Industry Council, Shanghai, 200237, China; [3] Shanghai Collaborative Innovation Center for Biomanufacturing Technology [SCIBT], Shanghai, 200237, China; [4] Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240146139)

语种：英文

外文关键词：Activation energy - Biodegradability - Calcium - Chemical bonds - Chemical modification - Chemical stability - Degradation - Reaction kinetics - Thermal Engineering - Thermodynamic stability

摘要：Polyamide 4 (PA4) has garnered considerable attention due to its fully bio-based origin and biodegradability as a high-performance polyamide. Nevertheless, thermal degradation during the melting process impedes thermal processing, thereby constraining its potential for engineering plastics applications. To clarify the thermal degradation reactions of PA4 amidst intricate physical and chemical transformations, establishing a theoretical foundation for the thermal stability modification, we conducted a comprehensive analysis of PA4 thermal degradation coupled with crystallization, considering kinetics and reaction mechanisms. Calculation of reaction activation energies and mechanism functions revealed that PA4 pyrolysis is a two-stage compound process, with distinct degradation mechanisms attributed to the crystalline and amorphous regions. Additionally, the thermal degradation mechanism of the PA4-CaCl2 composite system at varying crystallinity levels was illustrated. The incorporation of Ca strengthens intermolecular forces in the samples, leading to an increased overall stability. Simultaneously, a notable alteration in the reaction mechanism was observed in the crystalline zone lacking the Ca phase. ? 2024, The Authors. All rights reserved.