Abstract
A series of substituted poly(biphenylene oxide)s (PBPOs) was synthesized via nucleophilic nitro displacement reactions. High molecular weight PBPO's with nitrile groups were effectively synthesized from the polymerization of A-B type monomers with K2CO3 as a base in N-methyl-2-pyrrolidinone (NMP) at 140°C. The polymers are completely amorphous, soluble in polar aprotic solvents, and formed flexible films on solution casting. Para-linked PBPO with nitrile groups showed excellent thermal properties such as high 5% weight loss temperature above 530°C and Tg at 241°C which is higher than those of commercially available PPO™ (Tg=210°C). The pendent nitrile groups of PBPO were easily transformed to carboxylic acid groups by acidic hydrolysis.
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