Long-term Thermo-oxidative Degradation Modeling of a Carbon Fiber Reinforced Polyimide Composite: Multistep Degradation
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2425-7 Chinese J. Polym. Sci.
Long-term Thermo-oxidative Degradation Modeling of a Carbon Fiber Reinforced Polyimide Composite: Multistep Degradation Behaviors and Kinetics Yi Liua,b, Xiao-Zhou Xub,c, Song Mob, Bang-Wei Lanb,c, Cai-Zhen Zhua, Cui-Hua Lia, Jian Xua, and Lin Fanb,c* a Institute of Low-dimensional Materials Genome Initiative, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China b Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China c School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract This study aims to disclose the thermo-oxidative degradation behaviors and kinetics of a carbon fiber reinforced polyimide (CFRPI) composite for modeling of the long-term degradation process. The degradation behaviors were revealed through off-gas products analysis, and the overall kinetic interpretation was achieved from study of the mass-loss curves recorded under dynamic conditions. It was found that thermooxidative degradation of the CFRPI composite was a multistep process, which included four main reaction steps. Since most kinetic analysis methods were derived from simple reactions described by a single kinetic triplet, they cannot be applied reliably to such a process. Therefore, we firstly separated the four overlapped reaction steps by peak fitting of derivative thermogravimetric curves using Frasier-Suzuki equation considering the asymmetrical nature of kinetic curves, and subsequently analyzed each individual reaction employing Friedman method and experimental master-plots method. Four sets of kinetic triplets were determined to characterize the entire degradation process. The validity of four corresponding kinetic triplets was confirmed by perfect simulation of mass-loss curves recorded at both dynamic conditions used in kinetic analysis and entirely different isothermal conditions. Finally, modeling of long-term aging at 400 °C of the CFRPI composite was successfully achieved based on these kinetic triplets. The predicted mass loss and flexural property correlated well with experimental results. This study can serve as a basis for rapid evaluation of the long-term durability of the CFRPI composite in various application environments. Keywords Polyimide composite; Thermo-oxidative degradation; Multistep process; Kinetics; Long-term aging modeling Citation: Liu, Y.; Xu, X. Z.; Mo, S.; Lan, B. W.; Zhu, C. Z.; Li, C. H.; Xu, J.; Fan, L. Long-term thermo-oxidative degradation modeling of a carbon fiber reinforced polyimide composite: multistep degradation behaviors and kinetics. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2425-7
INTRODUCTION Polyimides with rare combination of excellent thermal stability in various environments, unique dielectric properties, high mechanical properties, and high solvent and radiation resistance unparalleled by most other kinds of polymer
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