ODPA/异构ODA共聚酰亚胺的合成及其性能研究  

Study on the synthesis and property of copolyimide derived from ODPA/isomeric ODA

作　　者：刘蓓蓓[1] 朱志国[1] 王锐[1] 陈放[1] 

机构地区：[1]北京服装学院材料科学与工程学院,北京100029

出　　处：《化工新型材料》2012年第7期70-73,共4页New Chemical Materials

基　　金：北京市服装材料研究开发与评价重点实验室开放课题(2010ZK-04)资助;北京市人才强教计划-高层次人才项目(PHR20100505)

摘　　要：采用3,3′,4,4′-二苯醚四甲酸二酐(3,3′,4,4′-ODPA),4,4′-二氨基二苯醚(4,4′-ODA)和3,4'-二氨基二苯醚(3,4′-ODA)为原料合成了共聚酰亚胺,实验中还以邻苯二甲酸酐(PA)为分子量调节剂,制备了理论分子量为10000的共聚酰亚胺,主要研究了其热性能和结晶性能。结果表明,与均聚型聚酰亚胺(ODPA/4,4′-ODA为原料合成)比较,间位异构体3,4′-ODA的加入使聚酰亚胺的玻璃化转变温度降低。经过等温结晶处理后,能够在DSC测试中出现较明显的熔融峰,而且延长结晶时间或者升高结晶温度有利于晶体的进一步完善。但是当共聚单体3,4′-ODA的加入量增加到10%(摩尔比)时,即使经过较长时间的等温处理,该共聚酰亚胺依然为无定形结构。A series of copolyimides based on 3,3′,4,4′-oxydiphthalic dianhydride （3,3′,4,4′-ODPA） and isomeric oxydianiline （4,4′-ODA and 3,4′-ODA） were synthesized. The molecular weights were controlled using phthalic anhydride （PA） as end capping agent. The thermal property and crystalline behavior were investigated by means of TGA, DSC, and WAXD. The results showed that, compared with the homopolyimides from 3,3′, 4,4′-ODPA and 4,4′-ODA, the glass tran- sition temperature of copolyimides decreased with increasing content of meta isomer 3,4′-ODA. Obvious fusion peaks ap- peared in the subsequent DSC heating scan after isothermal crystallization process, In addition, crystal domains become more perfect through prolonging the time of isothermal crystallization and/or elevating the crystallization temperature, demon- strated by higher melt temperature （Tm） and fusion enthalpy. However, the copolyimide with more 3,4′-ODA loading （o- ver 10%,molar ratio） showed no crystalline behavior,even after isothermal treat.

关 键 词：3 3′ 4 4′-ODPA 4 4′-ODA 3 4′-ODA 共聚酰亚胺 热性能 结晶性能 

分 类 号：O633.22[理学—高分子化学]