Modification of polycarbonate (PC) with poly(ethylene terephthalate) (PET)
Commercial PC/PET granulate blends were prepared by extrusion in a single-screw extruder. PET contents in the melts were 10, 20, 30, 40, and 50 wt. %. The compositions of the blends were studied (over 10—50 wt. % of PET) on how they affected the solubility in dioxane, softening temperature, and mechanical properties (notched impact strength, hardness, tensile strength and elongation at break). The PC/PET blends were fund to exhibit higher fluidity and be processible at lower temperatures than the individual polymers. On being processed, PC reacted with PET to yield macromolecular products that rendered a distinct phase boundary between the components of the blends unidentifiable. The strength property data for PC/PET blends were close to, or even better than those of unmodified PC. An exception was the impact strength which was reduced at PET contents in the blends higher than 30%.
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