REACTIVE BLENDS OF THERMOPLASTIC POLYURETHANES AND POLYVINYL CHLORIDE) WITH VARYING TYPES OF POLYURETHANE MONOMERS

摘要

The blending technique in this study consists of two sequential stages of mixing and reaction. In the first stage, the PVC is pre-blended with two monomers of the TPU (soft segment and chain extender). In the second stage, the in-situ polymerization of the TPU with the PVC takes place upon the addition of the third monomer of the TPU (diisocyanate). Therefore, the miscibility and reactivity of the TPU monomers with PVC play a role to govern their properties and processing sequence. The effect of chemical structure, isomerism, NCO and OH content of the TPU monomers on the miscibility, thermal and mechanical properties of the reactive blends of PVC/TPU are studied