Experimental Study on the Thermodynamics and Thermal Stability of Polyimide BTDA-ODA

SongYongji^a,b,  Meng Shuanghe^b,   Wang Fudong^b,  Sun Caixia^b,  Tan Zhicheng^b
(^aSchool of Chemical and Material Engineering, Beijing Institute of Petrochemical Technology, Beijing 102600)
(^bThermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023)

Abstract In the present study polyimide BTDA-ODA sample was prepared by polycondensation or step-growth polymerization method. Its low temperature heat capacities were measured by an adiabatic calorimeter in the temperature range between 80 K and 400 K. No thermal anomaly was found in this temperature range. A DSC experiment was conducted in the temperature region from 373 K to 673 K. There was no phase change in this temperature range except a glass transition at 420.16 K and an elasto-viscous transition at 564.38 K. BTDA-ODA started to decompose at 673 K and the peak temperature was at ca. 773 K.
Key words Polyimide, Thermodynamics, Thermal analysis, Thermal stability, Calorimetry

缩合聚酰亚胺BTDA-ODA的热力学及热稳定性研究

宋永吉^1,2 孟霜鹤² 王复东² 孙彩霞² 谭志诚²
(¹北京石油化工学院化工系 北京 102600 ²中国科学院大连化学物理研究所 大连 116023)

摘要 由3,3', 4,4'-二苯甲酮四酸二酐(benzophenone-3,3', 4,4'-tetracarboxylic acid dianhydride，简称 BTDA)，和4, 4'-二氨基二苯醚(4, 4'-diaminodiphenyl ether 简称ODA)缩合制备了聚酰亚胺BTDA-ODA样品，通过低温量热的方法研究了其热容及低温热稳定性，同时由热容数据计算了以标准状态（298.15 K）为基准的，在80 K到400 K温度范围内的热力学数据。通过热分析的方法（TG，DSC）研究了其高温热稳定性和热分解特性。
关键词 聚酰亚胺 热力学 热分析 热稳定性 低温量热