摘要
采用3,3'-二甲基-4,4'-联苯二异氰酸酯(TODI)与4,4'-二苯甲烷二异氰酸酯(MDI)作为共聚单体与偏苯三酸酐(TMA)反应制备了一系列聚酰胺酰亚胺(PAI)绝缘漆。讨论了TODI与MDI的比例对PAI溶液的储存稳定性、PAI树脂的溶解性能以及PAI漆膜的耐热性能、力学性能和介电性能的影响。结果表明:TODI分子结构中的刚性联苯链段可以提高共聚物的耐热性,但同时会在一定程度上降低PAI溶液的储存稳定性。当TODI与MDI的物质的量之比为2∶8时,制备的PAI具有优良的综合性能。
A series of polyamide-imide（PAI） was prepared by copolycondensation reaction among 4,4′-di- phenylmethane diisocyanate （MDI）, 3,3′-dimethyl-4,4′-biphenylene diisocyanate（TODI） and trimellitic anhydride（TMA）. The effects of the ratio of TODI to MDI on the storage stability of the PA! solution, solubility of the PAI resin, thermal stability, mechanical properties and dielectric properties of the PAI film were investigated systematically. The results show that the rigid biphenylene moiety in TODI can improve the thermal stability of the PAI, but will decrease the solubility of the solution to some degree. When the molar ratio of TODI to MDI is 2：8, the prepared PAI exhibits excellent comprehensive properties.
出处
《绝缘材料》
CAS
北大核心
2012年第6期5-8,共4页
Insulating Materials
关键词
聚酰胺酰亚胺
联苯
热稳定性
力学性能
绝缘漆
polyamideimide
biphenyl
thermal stability
mechanical properties
insulating varnish
