Abstract
Polycarbonate (PC) and polydimethylsiloxane (PDMS) rubber blend were made by melt blending using a twin-screw extruder. The blends were characterized by mechanical testing, thermal studies, electrical properties and morphological studies. The notched lzod impact strength increased greatly when the rubber content was 20%. The morphology of PC/PDMS blends showed dispersed rubber particle in the PC matrix. The impact strength, which increased with PDMS rubber concentration, has been analyzed on the basis of the interphase adhesion and crazing mechanisms. Tensile and flexural modulus as well as strength decreased with increase in PDMS rubber content. Predictive models have been used to explain the tensile modulus and strength properties. Incorporation of PDMS decreases the glass transition temperature of PC and facilitates its processing. Scanning electron microscopy has been employed to study the phase structure.
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