苯并噁嗪-酚醛-环氧豆油三元聚合体系的热分解行为研究

摘要

通过热重分析法研究了苯并噁嗪-酚醛-环氧豆油(BA-NP- ESO)三元聚合体系在不同升温速率下的热分解动力学.利用Kissinger-Akahira-Sunose(KAS)法和Flynn-Wall-Ozawa(FWO)法求取了三元聚合体系热分解过程的表观活化能,当分解率在0.3～0.9范围内时,反应属于同一机理,两种方法求得的活化能分别为241.1kJ/mol和253.7kJ/mol.运用Coats-Redfern法和Achar法对非等温动力学数据进行分析,得到热分解反应的机理函数,其热分解反应为四级反应,符合随机成核和随后生长机理,两种方法求得的表观活化能分别为250.21kJ/mol和266.96kJ/mol,与KAS和FWO法的结果较为一致.%Thermal decomposition kinetics of the benzoxazine-phenolic-epoxidized soybean oil copolymers at different heating rates was investigated using thermogravimetric (TG) analysis. Kissinger-Akahira-Sunose (KAS) method and Flynn-Wall-Ozawa (FWO) method were adopted to determine the activation energy. It was found that the activation energy are 241. 1kJ/mol and 253. 7kJ/mol, respectively, when the decomposition rate is within the range of 0. 3 — 0. 9. Mechanism function was obtained from the analysis of TG-DTG curves by both Coats-Redfern and Achar methods. The kinetic equation of BA-NP-ESO decomposition obtained shows that the decomposition reaction is a forth-order reaction, and the thermal degradation follows random nucleation and nucleus growth mechanism. The activation energy obtained are 250. 21 kJ/mol and 266. 96kJ/mol, respectively, which are consistent with the results of KAS and FWO methods.