The Effect of Gel on the Deformational Behavior of Polyvinylchloride (PVC) and Nitrile Rubber (NBR) Blends

Abstract

Abstract Deformational behavior of four different types of PVC and NBR blends were tested by dynamic shear measurements at small deformation and tensile stress—strain measurements at large deformation. Among these samples, three of them were partially compatible blends having the same acrylonitrile content (33%) but different gel contents and gel types (microgel and macrogel) in the NBRs. The last blend was a completely incompatible blend having a lower acrylonitrile content (21%) in the NBR. From the dynamic measurements, a temperature-independent log G′−log G′ curve was obtained for the partially compatible blends. The curve moved to the right as gel content increased, indicating that the sample having higher gel content behaved more elastic. No temperature-independent curve was obtained for the completely incompatible blend. The tensile properties of the completely incompatible blend were much worse than those of the partially compatible blends. The latter showed strain hardening during the course of the deformation. The highest degree of strain hardening was observed with the macrogel-containing sample followed by the microgel-containing sample and the gel-free sample.