聚苯硫醚纤维的热降解动力学

Thermal degradation kinetics of polyphenylene sulfide fibers

为研究聚苯硫醚(PPS)纤维的热降解动力学,采用热失重法分析了聚苯硫醚纤维在氮气氛中以一定速率升温时的热降解动力学行为。用Kissinger、Flynn-Wall-Ozawa及Friedman 3种方法研究得到PPS纤维在氮气氛中的热降解动力学参数,并对PPS纤维的热稳定性进行了探讨。结果发现,随着升温速率的增加,PPS纤维的初始热降解温度及热降解速率最大时的温度均升高。采用Flynn-Wall-Ozawa及Friedman法得到PPS纤维的平均活化能、反应级数、指前因子分别为:185.0 kJ/mol、1.21、5.7×109;而采用Kissinger法得到PPS纤维在热降解速率最大时的活化能、指前因子分别为:228.3 kJ/mol、2.9×109。

In order to investigate the thermal degradation kinetics of Polyphenylene Sulfide（PPS） fibers,performance of PPS fibers were analyzed at certain heating rates in nitrogen by means of thermogravimetry.The kinetic parameters of PPS fibers were obtained according to Kissinger,Flynn-Wall-Ozawa and Friedman methods.In addition,thermal stability of PPS fibers was also investigated.It was found that both the initial decomposition temperature and the temperature at maximal thermal degradation rate increase with the increase of heating rate.The activation energy E,reaction order n and pre-exponential factors A of PPS fibers obtained by Flynn-Wall-Ozawa and Friedman methods are 185.0 kJ /mol,1.21 and 7 × 10^9,respectively.The activation energy E and preexponential factors A of PPS fibers at maximal thermal degradation rate obtained by Kissinger methods are 228.3 kJ /mol and 2.9 × 10^9 respectively.