Microwave-assisted synthesis of high thermal stability and colourless polyimides containing pyridine.

ABSTRACT: A novel aromatic diamine containing pyridyl side group, 4-pyridine-4,4-bis(3,5-dimethyl-5-aminophenyl)methane (PyDPM), was successfully synthesized via electrophilic substitution reaction. The polyimides (PIs) containing pyridine were obtained via the microwave-assisted one-step polycondensation of the PyDPM with pyromellitic dianhydride (PMDA), 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 3,3',4,4'-diphenylether tetracarboxylic dianhydride (ODPA) and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). Contrarily to the reported similar PIs, these PIs exhibit much higher thermal stability or heat resistance, i.e. high glass transition temperatures (T _gs) in the range of 358-473°C, and the decomposition temperatures at 5% weight loss over 476°C under nitro

SUBMITTER: Cheng K 

PROVIDER: S-EPMC6599801 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature