KINETIC STUDIES OF REACTIVE BLENDING OF THERMOPLASTIC POLYURETHANE WITH POLY(VINYL CHLORIDE) TO APPLY FOR REACTIVE EXTRUSION

摘要

The polymerization kinetics of thermoplastic polyurethanes (TPU) is studied by using differential scanning calorimetry (DSC), Raman spectroscopy, adiabatic temperature rise (ATR) and dynamic rheometry. The objective of this study is to develop the empirical kinetic equation(s) governing the TPU polymerization in a twin screw extruder, as well as including the effects of chemical structure, isomerism, NCO and OH content, catalyst and temperature on the TPU polymerization. The polymerization during the reactive blending process with Poly(vinyl Chloride) (PVC) is presented. The effects of shear rate and pressure on the kinetics model are also considered.