抗静电软质聚氯乙烯材料的研究

采用表面电阻测试和扫描电镜，分析研究了软质聚氯乙烯(PVC)树脂与炭黑(CB)复合体系的抗静电性与炭黑含量、分布形态、PVC树脂型号及混炼塑化工艺之间的关系。结果表明：在炭黑临界添加量18％时，较短的混炼时问内，不同型号的PVC树脂基体中均能形成导电网络，体系的导电性能迅速提高，可达到抗静电的目的。相同混合和成型条件下，与SG-3树脂相比，炭黑在相对分子质量较大的SG-2基体树脂中更易形成均匀分布形态，破坏导电网络，导致电性能随混炼时间迅速下降。力学性能测试表明：炭黑的加入使复合体系的拉伸强度和断裂伸长率降低。

Study on Antistatic Plasticized Poly(vinyl chloride)

Antistatic properties of carbon black (CB) filled plasticized poly(vinyl chloride) (PVC) were studied using surface resistivity tester and SEM. A critical CB content of 18 % was found independent of matrix resin, above which, at a short rolling time, the CB percolated and the conductivity of the system increased rapidly. The dispersion of CB in SG-2 resin (higher molecular weight) was more uniform than in SG-3 (lower molecular weight), the conductivity decreased rapidly with increasing rolling time. As the content of CB increased, the tensile strength and elongation at break of PVC/CB composites decreased.