Block copolymers based on 2,2‐bis(4‐hydroxyphenyl)‐propane polycarbonate. I. Preparation and properties of copolymers from a variety of homopolymers

Low molecular weight 2,2‐bis(4‐hydroxyphenyl)propane polycarbonate was block‐copolymerized with the bischloroformate of polymeric glycols of a variety of structural types. Poly(ethylene oxide), polytetrahydrofuran, and hydroxy‐terminated polystyrene gave the highest molecular weight copolymers with the polycarbonate. The presence of flexible blocks along the chain promoted the crystallization of the polycarbonate, which resulted in flexible polymers with high melting points. The polytetrahydrofuran copolymer was an elastomer. Preparative details and thermal and mechanical properties of cast films are given.