Polyimides containing a novel bisbenzoxazole with high T g and low CTE

Haiquan Chen; Fengna Dai; Mengxia Wang; Chunhai Chen; Guangtao Qian; Youhai Yu

doi:10.1039/d1ra02218k

Polyimides containing a novel bisbenzoxazole with high T _g and low CTE

RSC Adv. 2021 May 7;11(28):16924-16930. doi: 10.1039/d1ra02218k. eCollection 2021 May 6.

Authors

Haiquan Chen¹, Fengna Dai¹, Mengxia Wang¹, Chunhai Chen¹, Guangtao Qian¹, Youhai Yu¹

Affiliation

¹ Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University Shanghai 201620 P. R. China qgt@dhu.edu.cn yuyouhai@dhu.edu.cn +86-21-67798670.

Abstract

A novel diamine named (2,2'-bibenzoxazole)-5,5'-diamine (DBOA) and derived polyimides (PIs) were successfully synthesized. The rigid, linear, symmetrical molecular structure and the strong charge transfer complex (CTC) were considered to be the reasons for the improved molecular packing and enhanced thermal properties of the polymers. These DBOA based PIs exhibited a higher glass transition temperature (T _g) and lower coefficient of thermal expansion (CTE) than traditional benzoxazole (BOA) based PIs. Meanwhile, the PI derived from DBOA and BPDA (3,3',4,4'-biphenyltetracarboxylic dianhydride) exhibited high T _g (395 °C) and low CTE (8.9 ppm per °C), and is expected to be applied in organic light-emitting diode (OLED) displays.