Title: Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane

Author: Zhongxu Lan, Xueli Chen, Xiao Zhang, Chongyu Zhu, Yanlei Yu, Jia Wei *

Journal: Polymers, 2019, 11(6), 1058

Abstract:

Optically transparent polyimides with excellent thermal stability and shape memory effect have potential applications in optoelectronic devices and aerospace industries. A series of optically transparent shape memory polyimide hybrid films are synthesized from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2'-bis-(trifluoromethyl)biphenyl-4,4'-diamine (TFMB) with various polyhedral oligomeric silsesquioxane (POSS) contents and then subjected to thermal imidization. The hybrid films show good optical transparency (>80% at 400 nm and >95% at 500 nm) with cutoff wavelengths ranging from 318 to 336 nm. Following the incorporation of the inorganic POSS structure, the hybrid films exhibit excellent thermal stability with glass transition temperature (Tg) ranging from 351 to 372 ℃. The hybrid films possess the highest Tg compared with the previously-reported shape memory polymers. These findings show that POSS is successfully utilized to develop transparent polyimides with excellent thermal stability and shape memory effect.

论文链接：https://www.mdpi.com/2073-4360/11/6/1058

PDF下载：Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane.pdf

在这项研究中，我们通过将不同含量的多面体低聚倍半硅氧烷（POSS）和氟化单体（6FDA/TFMB）进行共聚获得了一系列具有良好透明度、优异热稳定性和形状记忆效应的热固性PI-POSS杂化薄膜。以含氟二胺和二酐为单体，使PI薄膜具有良好的透明性。加入无机POSS结构后，杂化薄膜表现出优异的玻璃化转变温度（Tg)，其范围可达351至372 °C，表明POSS有望用于开发具有优异热稳定性和形状记忆效应的透明聚酰亚胺。