Abstract
A comprehensive SANS study on both rigid and plasticified suspension PVC demonstrates the presence of superstructural order in this polymer. Comparison of the experimental scattering invariant data with a tentative two-phase model points to specific penetration of the plasticifier in the noncrystalline regions of PVC. Thermal experiments manifest the gradual and thermoreversible melting of the crystalline regions at temperatures above 80-90 o C. Unixial deformation experiments on plasticified PVC confirm the existence of a heterogeneous network-structure in PVC where the crystalline tie-points act as physical cross-links
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