SYNTHESIS OF POLY(BISPHENOL-A CARBONATE)-GRAFT-POLYSTYRENE VIA THE MACROMONOMER TECHNIQUE

The synthesis of poly(bisphenol-A carbonate)-graft-polystyrene with gr afts of definite, predictable, nearly identical length was achieved us ing the macromonomer technique, i. e., copolycondensation of polystyre ne macromonomers, carrying aromatic hydroxyl functions, with bisphenol -A and triphosgene in pyridine/methylene chloride solution. The incorp oration of the macromonomer into the polycarbonate backbone was examin ed both qualitatively and quantitatively. The copolycarbonates show - in the contrast to polystyrene/polycarbonate blends of comparable mole cular weights and composition - only one glass transition temperature, which proved to be dependent on the polystyrene content, following th e Fox equation. The title compounds exhibit reduced stress-induced bir efringence compared to polycarbonate.