Struktur und Eigenschaften von Mehrphasenkunststoffen II. Kautschukmodifizierte Polycarbonate

Commercial polycarbonates are based on bisphenol A. They have high impact strength combined with high heat distortion temperatures. Polycarbonates based on other bisphenols mostly show low impact strngth whereas other properties often are improved; e.g. tetramethylbisphenol A-polycarbonate (TMBPA-PC) is characterized by high second order transition temperature (205°C), a good saponification stability, but its impact strength is not sufficient for some applications. Its impact strength can be improved by modification with styrene grafted rubbers. As a consequence of the compatibility of TMBPA-PC and polystyrene the polymer blends have high heat distortion temperatures excellent processibility and good impact strength. Due to the relatively low refractive index (n = 1.546) transparent blends can be achieved.