PVC/CPE/CaCO_3复合材料熔体的动态流变行为

Dynamic Rheological Behaviors of PVC/CPE/CaCO_3 Composites

以聚氯乙烯(PVC)为基体,采用熔融共混法制备了PVC/氯化聚乙烯(CPE)/碳酸钙(CaCO3)复合材料,对不同CPE含量的PVC/CPE/CaCO_3复合材料的动态流变行为与力学性能进行了研究。结果表明:随着CPE含量的增加,复合材料熔体的储能模量(G′)与损耗模量(G″)先升高后降低,而松弛指数(λ_1)、特征松弛时间(τ_2)则分别呈现减小与增大的趋势,当CPE含量由0phr变为10phr时,复合材料冲击性能提高了约133.5%。通过对复合材料熔体动态流变行为进行分析,可以推测出CPE与CaCO_3颗粒之间逐渐形成部分包覆、全包覆、过包覆的结构模型,从而解释了CPE增韧复合材料的机理。

Polyvinyl chloride （PVC）/chlorinated polyethylene （CPE）/calcium carbonate （CaCO3） com- posites with PVC as the matrix were prepared by using melt compounding method, the dynamic rheo- logical behavior, as well as the mechanical properties of PVC/CPE/CaCO3 composites modified with varied amounts of CPE were studied. The results show that with the increasing content of CPE, the storage modulus and loss modulus increases first and then decreases, while the relaxation index λ1 and relaxation time τ2 exhibit a decreasing trend and an increasing trend, respectively. When the content of CPE ranges from 0phr to 10phr, the impact strength increases by about 133.5%. Through analy- zing the dynamic rheological behavior of the composites, it can be inferred that a semi-encapsulated, fully-encapsulated, extra-encapsulated model appears between CPE and CaCO3 particles, which ex- plains the toughening mechanism of CPE in the composites.