Miscibility Study of PVC/PCL Blend by Compressible Regular Solution (CRS) Model and Dilute Solution Viscometry (DSV)

Miscibility of Polyvinylchloride/Polycaprolactone (PVC/PCL) Blend has been studied by the compressible regular solution (CRS) model and Dilute Solution Viscometry (DSV) method. It was found that phase behavior predicted by CRS model, is so sensitive to solubility parameter (δ) of components. So, it was tried to obtain the exact value of PVC and PCL s δ by using their intrinsic viscosity. The result showed THF is the best solvent for them. Phase diagram calculated by CRS model, indicated miscibility of blend up to 150°C. According to Δ[ ], PVC/PCL blend is immiscible for the whole studied range; while, α parameter represented miscibility for some ranges of volume fraction. This disagreement in DSV was ascribed to the parameters that were selected to determine the compatibility