塑料Journal of Polymer Research

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Abstract: The intrinsically impact brittle nature of the PC/PET blends can be effectively toughened by
incorporating butylacrylate core-shell rubber. The rubber-modified PC/PET blend possess both excellent low
temperature impact properties and reduced notch sensitivity. The ductile-brittle transition temperature of the
blend decreases with the increase of rubber content. The presence of rubber in the PC/PET blend does not relieve
the strain rate induced yield stress increase. Two separate modes， localized shear yielding and mass hear yielding，
work simultaneously in the rubber toughening mechanism. The plane-strain localized shear yielding dominates
the toughening mechanism at lower temperature and results in brittle failure. At higher temperature， the plane-
stress mass shear yielding dominates the toughening mechanism and results in ductile failure. The critical plastic
zone volume can be used to interpret the observed phenomenon.