Avaliação do comportamento reológico e do grau de compatibilidade da blenda policloreto de vinila (PVC) - copolímero etileno - acetato de vinila (EVA).

Abstract

Industry shows a great interest in studying polymer blends as a means of cheap and efficient modification of mechanical properties of polymeric systems. Criterious choice of blends components allows one to ajust its properties to specific purporses. Conventional plasticizes used with PVC tend to migrate, exude and volatize during processing and use, which causes a decrease on the final properties of the product. In order to minimize this problem the performance of polymeric additives has been investigated. In this work, mechanical and rheological properties, as well as the compatibility of plastified PVC/EVA blends with EVA contents varying from 0 - 1 3 % wt/wt were investigated. The effects of varying VAc contents (20 - 60%) as well as the molecular weight of the EVA copolymer properties were also determined. Our results show that the compatibility, processability and mechanical properties of plasticized PVC ( PVC* ) / EVA blends could be improved by employing EVA copolymers with high vynil acetatye (VAc) contents.