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采用正电子湮没对添加聚丙烯酸酯类（ACR）增韧粒子的聚氯乙烯（PVC）共混材料进行了研究。结果表明，随ACR比例的上升，PVC结构中氯原子的强电负性受到削弱，PVC主链区和结构改性剂中自由体积缺陷尺寸及数量增加。
Positron annihilation was used to study the polyvinyl chloride (PVC) blends added with polyacrylonitrile (ACR) toughening particles. The results show that with the increase of the ratio of ACR, the strong electronegativity of the chlorine atom in PVC structure is weakened, and the size and number of free volume defects in the main chain of PVC and the structure modifier increase.