文献类型：期刊文献

中文题名：聚亚苯基苯并二噁唑的热分解行为

英文题名：Thermal Degradation of Poly(p-phenylenebenzobisoxazole)

作者：张敏[1];唐来安[1];庄启昕[1];吴平平[1];韩哲文[1]

机构：[1]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室,上海200237

年份：2006

卷号：32

期号：1

起止页码：60

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：2006089716004);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家科技部"863"计划(2002AA305109);上海市重点学科建设项目资助

语种：中文

中文关键词：热失重;热分解;活化能;Ozawa法;聚亚苯基苯并唑

外文关键词：thermogravimetry; thermal degradation; activation energy; Ozawa method; poly （p-phenylenebenzobisoxazole）

摘要：用热失重方法分析了聚亚苯基苯并二唑(PBO)纤维在不同气氛中的热分解行为,采用O zaw a法计算了PBO纤维在氮气和空气两种气氛中的热分解活化能。结果表明升温速率对PBO纤维的热分解温度有较大影响;氧气作为热分解反应的引发剂,大大降低了分解反应的活化能;由IR光谱对不同温度裂解产物结构的分析,推测了热氧化降解对PBO纤维分子结构的影响;在不同失重率时几乎相同的热分解活化能,表明无论热分解的气氛如何,PBO纤维的热分解均是一个无规引发的单阶段过程;结合PBO纤维在两种气氛中的热分解机理,解释了分解气氛对残碳率的影响。
TGA runs were performed for investigating thermal stability of Poly（p-phenylenebenzobisoxazole） （PBO） fiber. Under the air or nitrogen environment, the decomposition temperature was affected by the heating rate; a greater heating rate resulted in a higher decomposition temperature. Oxygen served the role of an initiator in thermal degradation of PBO fiber and significantly reduced its activation energy. Using the Ozawa method, the activation energy of thermal degradation in air was about half of that in nitrogen; therefore, PBO fiber was more heat resistant in nitrogen than in air. Almost the same activation energy was calculated from different residual weights suggesting the decomposition of PBO fiber in air or nitrogen was a single step process. IR analysis of the degradation reactions in air was employed for determining the effect of thermo-oxidation behavior on PBO fiber structure.