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Abstract
The impact strength of modified rigid PVC depends primarily on the volume fraction of the rubbery phase and its morphology. The volume fraction is a function of the addition level and the modifier density. The morphology depends upon a given process, on the viscosity ratio between modifier and matrix and their compatibility. Lower density polymers therefore have a significant advantage over traditional modifiers as they can be used at lower dosage, provided they can be sufficiently compatibilised to give a stable morphology. The present study will discuss these interactions and their practical implications for physical properties and processing and present a novel technology for impact modification of PVC with low-density modified polyolefin.