Rheological Behaviors of Polymer-matrix Nanocomposites

摘要

Polymer-matrix nanocomposites compounding with silicate layers and nanoparticles have attracted more and more attensions due to their unique properties. Their rheological properties are an important for their processing. In this paper, the rheological behaviors of polymer/silicate layer nanocomposites were summaried, and the rheological properties of Poly (vinyl chloride) (PVC)/calcium carbonate (CaCO_3) nanocomposites were focusinglly investigated. In general, the intercalated or exfoliated silicate layers increase the viscosity of the related polymer/silicate layer nanocomposite. However, the incorporation of nanoparticles improves the processability of polymeranoparticle nanocomposite. The different rheological behaviors are caused by the different geometric shapes of layered silicates and nanoparticles. For polymeranoparticle nanocomposites, the "ball bearing" effect of the spherical nanoparticles decreased the apparent viscosity of the polymeranoparticle nanocomposite melts, and the viscosity sensitivity on shear rate of the polymeranoparticle nanocomposite is higher than that of neat polymer.