一步法制备可溶性聚酰亚胺及其性能研究

One-step Synthesis and Characterization of Organo-soluble Copolyimide

以2,2双[4(4氨基苯氧基)苯基]丙烷(BAPP)、2(4氨基苯基)5氨基苯并咪唑(BIA)、3,3’,4,4’二苯酮四酸二酐(BTDA)为原料,以N甲基2吡咯烷酮(NMP)为溶剂,通过高温一步法合成一系列含甲基和咪唑杂环的可溶性聚酰亚胺(BTDA BAPP/BIA),并对聚合物薄膜进行结构与性能测试.结果显示,通过高温一步法制得的聚酰亚胺分子量较高,且在极性溶剂NMP、DMAc中都表现出优异的溶解性;得益于咪唑杂环的引入,所得PI薄膜均表现出优异的力学性能,且PI A3B7薄膜的断裂强度可达123 MPa,断裂模量为2.96 GPa;动态热机械分析及热重分析测试结果显示,随着BIA含量的增加,薄膜样品的玻璃化转变温度和热稳定性随之增加,其中PI A3B7的玻璃化转变温度为328℃.

A series of organo-soluble polyimide were synthesized via one-step method at high-temperature in NMP solution from the fluorinated polyetherimide(BTDA-6FAPB/BIA),fluorinated rigid-like polyimide(BTDA-TFMB/BIA)and methylic polyetherimide(BTDA-BAPP/BIA).The obtained polyimides exhibited high molecular weights and excellent solubility in non-proton strong polar solvents such as DMAc and NMP.Thanks to the introduction of imidazole heterocycles,the PI films showed good mechanical properties,and the tensile strength of PI-A3B7 film with higher BIA content could reach 123 MPa,and the initial modulus was 2.96 GPa.Moreover,with the increasing content of BIA,the glass transition temperature and thermal stability of the films increased accordingly,and the glass transition temperature of PI-A3B7 reached up to 328℃.