氯乙烯共聚弹性体对聚氯乙烯的改性及性能影响

以氯乙烯-丙烯酸丁酯-甲基丙烯酸甲酯共聚弹性体（VCE）增韧改性PVC树脂提高聚氯乙烯（PVC）的抗冲击性能，并与传统抗冲击改性剂甲基丙烯酸甲酯-丁二烯-苯乙烯共聚物（MBS）、ACR及氯化聚乙烯（CPE）改性的PVC材料比较。对改性PVC的流变性能、力学性能、热变形性能及断面结构进行表征和微观观察。结果表明，随着VCE含量的增加，PVC的拉伸强度与弯曲强度逐渐减小，抗冲击强度与断裂伸长率逐渐增加，热变形温度逐渐降低；在相同用量的条件下，VCE对 PVC的改性效果优于ACR及CPE，达到MBS改性PVC的水平，VCE能够增韧PVC，提高PVC的抗冲击性能，是一种性能优异的新型PVC抗冲击改性剂。

Effect of Vinyl Chloride Copolymer Elastomer on Modification and Properties of PVC

A vinly chloride-butyl acrylate-methly methacrylate copolymer elastomer (VCE) was used to modify PVC resin for improvement of impact resistance, and a comparative investigation was also carried out for the modification effect on PVC with MBS, ACR and CPE. The rheological, mechanical and thermal deformation properties of the modified PVC resins were investigated, and their cross-sectional morphologies were observed. In the view of the comparative results, the modified PVC resins presented a decrease in tensile strength and bending strength but an increase in impact strength and elongation at break increased. Moreover, their thermal deformation temperature decreased with an increase of VCE content. VCE was found to have better modification effect than ACR and CPE but a similar effect with MBS. VCE shows a significant toughening effect on PVC, and therefore it can be taken as a promising impact modifier for PVC.