Syntheses of New Containing Ester Structure of Polyimide Materials with Low Coefficient of Thermal Linear Expansion and Low Water Absorption

Two series of new diamine monomer containing ester structure named his (4-aminophenyl) terephthalate (BPTP) and 4-aminophenyl-4'-aminophenylbenzoate(APAB) in the main-chain were introduced in this paper. A variety of poly (ester imide) s (PEIs) was prepared using BPTP and APAB with some commercial dianhydrides. A series of poly(ester imide) s was synthesized. By the test of the thermal stability and mechanical properties, the polymers show excellent thermal stability, mechanical properties, low water absorption. Due to the introduction of the ester structure in the main chain, the polymer show a low linear coefficient of thermal expansion(CTE) and water absorption.