聚酰亚胺
材料科学
热稳定性
玻璃化转变
多孔性
极限抗拉强度
高分子化学
化学工程
分子间力
邻苯二甲酸二丁酯
复合材料
乙醚
聚合物
有机化学
分子
化学
图层(电子)
工程类
作者
Jianwei Li,Guangcheng Zhang,Zhanxin Jing,Jiantong Li,Lisheng Zhou,Hongming Zhang
标识
DOI:10.1177/0954008317697803
摘要
In this study, a series of porous polyimide films containing benzimidazole units were prepared through a phase separation process. The dibutyl phthalate was selected as porogen. The copolyimides were prepared by the reaction of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride with two diamines of 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) and 4,4′-diaminodiphenyl ether with various molar ratios. The resultant porous polyimide films exhibit optimum cell-size distributions. The effects of BIA on morphology, mechanical, and thermal properties of the porous films were explored. It was found that as the BIA content reached up to 30 mol%, the porous copolyimide film demonstrates remarkable thermal stability and admirable mechanical properties with the glass transition temperature of 294°C, 5% weight loss temperature in argon flow up to 545°C, and a tensile strength of 48 MPa. The incorporation of BIA into the polyimide chains brought the highly rigid structures and strong intermolecular interactions, resulting in the enhancement in the thermal stability and the mechanical properties.
科研通智能强力驱动
Strongly Powered by AbleSci AI