采用凝胶渗透色谱(GPC)测定一种热塑性聚酰亚胺(TPI)的分子量及其分布;利用差示扫描量热仪(DSC)测定TPI的玻璃化转变温度(Tg);考察了分子量大小、热处理温度和热处理时间对玻璃化转变温度的影响.结果表明:Tg随数均分子量的增大而增加,采用Kanig-Ueberreiter方程关联Tg与数均分子量,其线性拟合度最高;由于聚酰亚胺的结构特点--存在自由端基,在高温可发生固相热环化反应,相应其分子量随处理温度的升高和处理时间的延长而增大,表现为聚合物的Tg有所升高.
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