基于阳离子-π的高强韧聚酰亚胺的制备及性能  

Preparation and Properties of High Strength and Toughness Polyimide Based on Cation-π

作　　者：张宇宇 常冠军[1] 马腾宁 ZHANG Yuyu;CHANG Guanjun;MA Tengning(School of Materials and Chemistry,Southwest University of Science andTechnology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010

出　　处：《西南科技大学学报》2023年第4期8-15,共8页Journal of Southwest University of Science and Technology

基　　金：国家自然科学基金项目(21973076)。

摘　　要：为提高聚酰亚胺薄膜(PI)的强度和韧性,设计了一种含有阳离子-π结构的PI-Na薄膜。通过在聚酰亚胺中引入Na^(+)和吲哚基团构筑“点对面”的多重结构,利用红外光谱、紫外-可见光谱、荧光光谱、分子动力学模拟计算以及EDS能谱等证明了阳离子-π相互作用的存在。由于阳离子-π相互作用具有相对较大的结合面积,能够简单快速地破坏和重建,PI-Na薄膜实现了优异的力学强度和韧性。与不含Na^(+)的PI薄膜相比,当Na^(+)与吲哚的摩尔比为1∶2时PI-Na薄膜的强度和断裂伸长率分别提高118%和51%。同时,PI-Na薄膜表现出优异的耐热性能,其5%热分解温度和玻璃化转变温度分别提高50℃和28℃。A PI-Na film containing cation-πcoordination structure was designed to improve the strength and toughness of polyimide films(PI).By introducing Na^(+)and indole groups into polyimide to construct a“point to face”multiple structure and utilizing the infrared spectroscopy,UV-vis spectroscopy,fluorescencespectroscopy,molecular dynamics simulation calculation and EDS spectra,the interaction of cation-πwas proved.Excellent mechanical strength and toughness of PI films were realized,resulting from a relatively large binding area of the cation-πinteraction in a simple and rapid destruction and construction.Compared with PI without Na^(+),the tensile strength and elongation at break increased by 118%and 51%respectively when n_(Na^(+))∶n_(indole) is 1∶2.At the same time,the PI-Na films exhibit excellent heat resistance because the 5%thermal decomposition temperature and glass transition temperature increased by 51℃and 28℃,respectively.

关 键 词：聚酰亚胺 阳离子-Π相互作用 Na^(+) 吲哚 增强增韧 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]