摘要
以4,4'-对苯二甲酰二邻苯二甲酸酐(TDPA)和均苯四甲酸酐(PMDA)为芳二酐单体,与4,4'-二氨基二苯醚(ODA)经溶液缩聚、热亚胺化制得PMDA/TDPA共聚酰亚胺薄膜,并用红外光谱、热重分析、差示扫描量热分析、力学性能测试等对薄膜的结构和性能进行表征。结果表明,在聚酰亚胺分子主链引入双酮基结构单元后,共聚酰亚胺树脂玻璃化转变温度(Tg)随着TDPA比例的增加逐渐下(Tg为322-285℃),溶剂流延成膜的加工性能得到显著改善,薄膜仍具有优良的热氧化稳定性和力学性能,5%热分解温度(Td5%)为517-550℃,拉伸强度为111-148 MPa。
A series of 1,2,4,5-benzenetetracarboxylic anhydride( PMDA) /4,4'-terephthaloyldiphthalic anhydride( TDPA) copolyimide films were synthesized by solution poly-condensation and thermal imidization. In these reaction,TDPA,PMDA and 4,4'-oxydianiline( ODA) were used as monomer. The structure and properties of the copolyimide films were characterized by FT-IR,TGA,DSC and mechanical testing. The results show that introduced the multi-ketone linkage to the main chain,the glass transition temperature( Tg) of copolyimide gradually decreases with the increasing ratio of TDPA( Tg: 322 - 285 ℃),and the solvent cast film processing performance is significantly improved.Meanwhile,the films keep excellent thermal and mechanical properties,5% thermal decomposition temperature( Td5%)is in the range 517 - 550 ℃,and the tensile strength is in the range 111 - 148 MPa.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第12期27-31,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51003044)
江西省自然科学基金资助项目(20132BAB206035)
北京分子科学国家实验室开放课题
高分子材料工程国家重点实验室(四川大学)开放课题(KF201304)
江西省教育厅科技落地计划(KJLD13023)
关键词
均苯四甲酸酐
4
4'-对苯二甲酰二邻苯二甲酸酐
共聚酰亚胺
热性能
力学性能
1
2
4
5-benzenetetracarboxylic anhydride
4
4'-terephthaloyldiphthalic anhydride
copolyimide
thermal properties
mechanical properties