Experimental Study on the Thermodynamics and Thermal Stability of Polyimide BTDA-ODA SongYongjia,b, Meng Shuangheb, Wang Fudongb, Sun Caixiab, Tan Zhichengb (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 宋永吉 男，38岁，博士学位，教授，主要从事传热学、热化学方面研究。 E-mail:songyj2000@sina.com 863项目(863-2-4-1-15)和国家自然科学基金(29773048)资助项目 2001-08-12收稿，2001-12-04修回 (PDF全文下载c02032)