Dynamic Viscoelastic Behavior of Model Poly(vinyl chloride) Blends Characterized at Small Deformation in Shear Oscillation

Abstract

In the present study, dynamic shear oscillation measurements at small strain were conducted on four model blends of equal amounts (50/50 by weight) of poly(vinyl chloride) (PVC) with three compatible and one incompatible polymers. The compatible polymers were nitrile rubber containing 30% acrylonitrile (NBR-30), poly(ε-caprolactone) (PCL), and copolyester thermoplastic elastomer (trademark HYTREL). The incompatible one was nitrile rubber containing 22% acrylonitrile (NBR-22). Double logarithmic plots of loss modulus G″(ω) against storage modulus G′(ω) were employed as a systematic, practical way of treating the data. The modulus logG″(ω)–logG′(ω) scheme was shown to enable one to characterize and interpret the viscoelastic behavior of the blends related to the mixing history and morphological changes.