The status of toughened PVC by blending modification at home is introduced. The mechanism, influencing factors and research achievements of PVC blending modification with elastomer or inelastomer have been reviewed.%介绍我国聚氯乙烯共混增韧改性的研究现状。分别对弹性体及非弹性体的增韧机理、影响增韧效果的因素，以及最近取得的成果作了概述。
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