Abstract
Isotactic polypropylene/poly(l-lactide) blends were toughened by blending polyethylene-glycidyl methacrylate (EGMA) as compatibilizer and dicumyl peroxide (DCP) as compatibilization accelerator. Isotactic polypropylene (iPP)/poly(l-lactide) (PLLA)/EGMA/DCP blends showed remarkably improved impact toughness and excellent flexibility, moderate levels of strength, and modulus. Reactive compatibilization between iPP and EGMA as well as PLLA and EGMA was studied using Fourier transform infrared spectroscopy. The “salami”-like phase structure of the dispersed domains in the iPP/PLLA/EGMA ternary blends was observed. With the further addition of DCP, the EGMA phase evolved from occluded sub-inclusions into an interface boundary. The significant increase in impact strength of iPP/PLLA/EGMA/DCP blends was ascribed to the effective interfacial compatibilization. This study provides a new route to prepare a cost-effective material with partial biodegradability, good impact toughness, and tensile strength. Meanwhile, a deep insight into the optimization of properties of multicomponent blends by morphology transition was proposed.
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