Abstract
AbstractThe modification of suspension‐type porous polyvinyl chloride (PVC) particles by an in situ stabilizer‐free polymerization/crosslinking of a monomer solution absorbed within the PVC particles is presented. The modifying polymers are polystyrene (PS) and poly(styrene‐co‐methyl methacrylate) (P(St‐co‐MMA)) crosslinked with divinyl benzene (DVB). The effect of the unique blending procedure on the physical and mechanical properties of PVC has been investigated. The modified PVC characterization includes polymerization yield, transparency, fracture surface morphology, thermal stability, dynamic mechanical properties, tensile properties, and impact resistance. The polymer chains formed are dispersed as a separate phase observed by scanning electron microscopy (SEM), typical of immiscible polymer blends. Various morphologies induced by injection molding were observed including ellipsoid, bead‐and‐string, and thin threads morphologies, which depend on the characteristics of the components as well as the processing conditions. Thermal stability was generally increased by the incorporation of PS or P(St‐co‐MMA) in PVC. Mechanical properties of PVC/P(St‐co‐MMA) blend reveal a substantial increase in elongation at break; PVC/PS blends, however, exhibit a brittle failure. Rigidity and tensile strength of the PVC‐based blends were maintained. Copyright © 2008 John Wiley & Sons, Ltd.
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