Preparation and properties of a novel quaternary copolymerized thermoplastic polyimide

eXPRESS Polymer Letters

X. Liu¹ 

关键词: tailor-made polymer;    quaternary copolymerized;    polyimide;    thermoplastic;    thermal resistance;   

DOI  :  10.3144/expresspolymlett.2019.44

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

A series of quaternary copolymerized thermoplastic polyimides (PI) films with good thermal resistance has beensynthesized via two-step method from bicomponent isomeric dianhydrides, 2,3′,3,4′-biphenyltetracarboxylic dianhydride(α-BPDA) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA), and bicomponent flexible diamines, 4,4′-oxydianiline(ODA) and 1,3-bis(4′-aminophenoxy)benzene (TPE-R). By adjusting the molar ratio of dianhydrides to diamines, its effectson the thermal stability, thermoplasticity and solubility of PI films were investigated in detail. The results showed that thesequaternary copolymerized PI films were in possession of both thermoplasticity and excellent thermal stability. It is derivedfrom the synergetic effect of isomeric dianhydrides and flexible diamines. It has also been found that there is one criticalmolar ratio between dianhydrides and diamines, that is, α-BPDA:s-BPDA:ODA:TPE-R = 50:50:50:50, at which the overallperformance is optimal.

【 授权许可】

CC BY