PREPARATION OF POLY(IMIDE-AMIDE) USING CYCLIC OLIGOMERS

摘要

PURPOSE: A manufacturing method of a poly(imide-amide)copolymer is provided to produce the poly(imide-amide)copolymer without generating a reaction by-product by controlling the mixture ratio of cyclic oligomers. CONSTITUTION: A manufacturing method of a poly(imide-amide)copolymer comprises the following steps: mixing two oligomers with different structure to form a reactant; and ring-opening polymerizing an alkali metal using the reactant as a fluoride catalyst to form a polymer. The weight average molecular weight of the copolymer is 5,000~100,000 g/mol. The thermal expansion coefficient of the copolymer is 5~80ppm/deg C.