Synthesis and characterization of novel polyimides derived from 2‐amino‐5‐(4‐aminophenyl)‐thiazole

Abstract

A new kind of aromatic unsymmetrical diamine monomer containing thiazole ring, 2-amino-5-(4-aminophenyl)-thiazole (AAPT), was synthesized. A series of novel polyimides were prepared by polycondensation of AAPT with various aromatic dianhydrides by one-step polyimidation process. The synthesized polyimides had inherent viscosity values of 0.36-0.69 dL/g and were easily dissolved in highly dipolar solvents. Meanwhile, strong and flexible polyimide films were obtained, which have good thermal and thermo-oxidative stability with the glass transition temperatures (T g ) of 276.7-346.18C, the temperature at 5% weight loss of 451-4928C in nitrogen and 422-4408C in air, as well as have outstanding mechanical properties with the tensile strengths of 94-122 MPa, elongations at breakage of 5-18%. These films also had dielectric constants of 3.12-3.38 at 10 MHz.

Synthesis and characterization of unsymmetrical benzonitrile‐containing polyimides: Viscosity‐lowering effect and dielectric properties

“…Aromatic poly(ether‐imides) derived from an unsymmetrical indane‐based diamine have been evaluated for gas permeation properties . Unsymmetrical diamines containing thiazole ring, triaryl imidazole pendant group, diphenylpyridyl pendant group, naphthalene unit, and phthalazinone moiety, have been designed for the syntheses of their respective PIs. In other cases, the PIs derived from unsymmetrical dianhydrides have also been prepared for the similar reasons .…”

Synthesis and characterization of ternary copolyimides derived from aromatic dianhydride and aromatic diisocyanates

“…In the past several decades, numerous novel monomers 23,26 –31 that could be used to prepare PIs emerged to meet the requirements for large-scale application. And the very common ones are aromatic diamines and aromatic dianhydrides.…”

<b>Synthesis and characterization of new copoly(amide-imide)s based on N,N’-(4,4’-diphenylsulfone)bistrimellitimide with different diacids and diamines</b>

“…To overcome these drawbacks, PI structures are often modified. One method uses copolymerization to synthesize copolymers to improve the processing ability, such as poly(amide-imide)s and copoly(amide-imide)s [3][4][5][6][7]. PAIs have the advantages of both PAs and PIs and possess thermal stability balanced with processability.…”