聚酰亚胺
乙醚
三氟甲基
间苯二酚
热稳定性
玻璃化转变
高分子化学
苯
均苯四甲酸二酐
对苯二酚
热分解
材料科学
胺气处理
化学
有机化学
聚合物
图层(电子)
烷基
作者
Chin‐Ping Yang,Yu‐Yang Su,Shiou-Jung Wen,Sheng‐Huei Hsiao
出处
期刊:Polymer
[Elsevier]
日期:2006-09-01
卷期号:47 (20): 7021-7033
被引量:77
标识
DOI:10.1016/j.polymer.2006.07.066
摘要
Two series of novel polyimides (5a–g and 6a–g) containing flexible ether linkages and pendent trifluoromethyl (CF3) groups were synthesized from 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride (3a) and 1,3-bis(3,4-dicarboxyphenoxy)benzene dianhydride (3b) with various CF3-substituted aromatic bis(ether amine)s (4a–g) via ring-opening polyaddition to poly(amic acid)s, followed by thermal or chemical imidization. These polyimides were readily soluble in a variety of organic solvents and could be solution-cast into flexible and tough films. The cast films exhibited high optical transparency and almost no color, with a UV–vis absorption edge of 368–382 nm and a very low b∗ value (a yellowness index) of 6.2–15.5. They had good thermal stability with glass-transition temperatures of 186–288 °C, and most of them did not show significant decomposition before 500 °C. Moreover, these polyimide films also possessed low dielectric constants of 2.79–3.49 (at 1 MHz) and low water uptakes (<0.65 wt%).
科研通智能强力驱动
Strongly Powered by AbleSci AI