GPC法测定二苯酮型聚酰胺酸分子量及其薄膜的热稳定性研究  

Determination on Molecular Weight of Benzophenone Polyamide Acids by GPC and Their Thermal Stability Study

作　　者：苏桂明[1] 方雪[1] 姜海健[1] 马宇良 张伟君[1] 张晓臣[1] 

机构地区：[1]黑龙江省科学院高技术研究院,哈尔滨150020

出　　处：《绝缘材料》2015年第9期53-55,59,共4页Insulating Materials

摘　　要：采用凝胶渗透色谱(GPC)法测定了二苯酮四酸二酐与二氨基二苯醚合成的聚酰胺酸的分子量,计算其分子量分布,绘制了两条不同的标准曲线,比较其对聚酰胺酸分子量大小的影响。通过热重分析方法测试了由不同分子量聚酰胺酸合成的聚酰亚胺薄膜的热稳定性。结果表明:聚合物分子量不会随着标准曲线选取样品分子量的不同而出现较大的差异,分子量均处于相同数量级范围内;在合适范围内,标准曲线的选取不会影响聚合物分子量的测量;由相对分子量大的聚酰胺酸合成的薄膜热失重温度较高,耐热性能较好。The molecular weight of polyamide acids, which were synthesized by benzophenone tetracarbox-ylic acid dianhydride and diaminodiphenyl ether, was determined by gel permeation chromatography （GPC） method, and their molecular weight distribution was calculated. Two different standard curves were drawn and their effects on the molecular weight of polyamide acids were compared. The thermal stability of polyimide films, which were synthesized by different molecular weight of polyamide acids, was tested by thermogravimetric analysis. The results indicate that the molecular weight of polymers shows no significant difference with different selection of standard curves, and the molecular weight all in the same order of magnitude. The weight loss temperature of the polyimide film synthesized by high molecu-lar weight of polyamide acid is higher, and its heat resistance is better.

关 键 词：凝胶渗透色谱(GPC) 聚酰胺酸 分子量 热稳定性 

分 类 号：TM206[一般工业技术—材料科学与工程] TM215.3[电气工程—电工理论与新技术]