Title: Colorless Semi-Alicyclic Copolyimides with High Thermal Stability and Solubility

Author: Zhongxu Lan, Chunyu Li, Yanlei Yu, Jia Wei *

Journal: Polymers, 2019, 11(8), 1319

Abstract:

A series of colorless copolyimide films with high thermal stability and goodsolubility are synthesized from (trifluoromethyl)biphenyl-4,4’-diamine (TFMB) with dierent 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA) to 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane (6FDA) dianhydride mole ratios through one-pot solution polycondensation. These copolyimide films exhibit excellent optical transparency (T400 > 90% and λ0 ~305-333 nm) with a thickness of 15 μm and good solubility in most organic solvents. The excellent optical properties are mainly attributed to the low inter- and intra-molecular charge transfer interactions due to the alicyclic structure and the strong electronegative CF3 groups. The glass transition temperature increases from 332 to 352 °C with increasing HPMDA content in the copolymers, while the thermal decomposition temperature is improved with increasing 6FDA content. These results indicate that the copolyimide films can be successfully utilized in the development of novel heat-resistant plastic substrates for the optoelectronic engineering applications.

论文链接：https://pubmed.ncbi.nlm.nih.gov/31394813/

PDF下载：Colorless Semi-Alicyclic Copolyimides with High Thermal Stability and Solubility.pdf

从(三氟甲基)联苯-4,4'-二胺(TFMB)、1,2,4,5-环己烷四羧酸二酐(HPMDA)、2,2'-双(3,4-二羧基苯基)六氟丙烷二酐(6FDA)出发，本文通过一锅溶液缩聚的方法共聚成功获得了一系列不同摩尔比HPMDA/6FDA的共聚聚酰亚胺(CPI)薄膜，并研究了聚合物组分与其性能的关系。将脂环族四羧酸二酐掺入氟化PI，改善了薄膜的光学透明性和Tg。同时，随着氟化二酐含量的增加，脂环族PI分解温度低的缺点得到了弥补。这些无色共聚酰亚胺薄膜在大多数有机溶剂中具有良好的溶解性，同时具有高热稳定性（Tg: 332–352 °C）和优异的光学性能（T400 > 90%和λ0 ~ 305-333 nm）。在得到的聚酰亚胺中，PI-40的综合性能最好，具有较高的热稳定性和透光率。这项工作为制备具有良好溶解性、高热稳定性和优异光学性能的CPI薄膜提供了新策略。