Dynamic Rheological Behaviors of PVC/CPE/CaCO₃ Composites

Abstract

Polyvinyl chloride(PVC)/chlorinated polyethylene(CPE)/calcium carbonate(CaCO3) composites with PVC as the matrix were prepared by using melt compounding method, the dynamic rheological 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 analyzing 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 explains the toughening mechanism of CPE in the composites.

Keywords

• PVC
• CPE
• calcium carbonate
• rheological behavior
• relaxation time