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Super-heat resistant, transparent and low dielectric polyimides based on spirocyclic bisbenzoxazole diamines with Tg > 450 °C
Polymer Chemistry ( IF 4.6 ) Pub Date : 2022-05-21 , DOI: 10.1039/d2py00513a
Peng Xiao , Xiaojie He , Feng zheng , Qinghua Lu

Maintaining ultra-high heat resistance and sufficient colorless transparency at the same time is a challenge for polymer materials because of conflicting design principles, but such materials are urgently needed for some optoelectronic devices. In this study, four new isomeric diamines with a spirocyclic bisbenzoxazole structure were synthesized, and their polyimides were prepared by condensation with commercial diamines, 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and cyclobutane-1,2,3,4-tetracarboxylic acid dianhydride (CBDA) followed by chemical imidization. The resultant polyimide (PI) films have excellent optical transparency with cut-off wavelengths in the range of 346 nm–380 nm, and 85%–90% transmittance at 550 nm. Also, these PIs possessed excellent solubility in common organic solvents, even in low-boiling-point solvents, such as chloroform, dichloromethane and tetrahydrofuran. Most importantly, the colorless polyimides displayed a super-high glass transition temperature (Tg), high thermal stability, and favorable mechanical properties, and their Tg reached 491 °C. The polyimides possessed low moisture absorptions of 0.52%–0.61% and low dielectric constants (Dk) of 2.32–2.93. The excellent comprehensive properties of the spirocyclic bisbenzoxazole-containing colorless transparent polyimides (CPIs) render these materials promising candidates for optical and optoelectronic applications.

中文翻译:

基于螺环双苯并恶唑二胺的超耐热、透明和低介电聚酰亚胺,Tg > 450 °C

由于设计原则相互矛盾,同时保持超高耐热性和足够的无色透明性对聚合物材料来说是一个挑战,但一些光电器件迫切需要这种材料。在这项研究中,合成了四种具有螺环双苯并恶唑结构的新型异构二胺,并通过与商业二胺、4,4'-(六氟异亚丙基)二邻苯二甲酸酐 (6FDA) 和环丁烷-1,2,3,4 缩合制备了它们的聚酰亚胺。 -四羧酸二酐 (CBDA),然后进行化学酰亚胺化。所得聚酰亚胺 (PI) 薄膜具有优异的光学透明度,截止波长范围为 346 nm–380 nm,在 550 nm 处的透射率为 85%–90%。此外,这些 PI 在普通有机溶剂中具有出色的溶解性,即使在低沸点溶剂中,如氯仿、二氯甲烷和四氢呋喃。最重要的是,无色聚酰亚胺显示出超高的玻璃化转变温度(T g )、高热稳定性和良好的力学性能,其T g达到491 ℃。聚酰亚胺具有 0.52%–0.61% 的低吸湿性和 2.32–2.93 的低介电常数 ( D k )。含螺环双苯并恶唑的无色透明聚酰亚胺 (CPIs) 的优异综合性能使这些材料成为光学和光电应用的有希望的候选材料。
更新日期:2022-05-21
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