Dynamic Mechanical and Morphological Studies on the Compatibility of Plasticized PVC/Thermoplastic Polyurethane Blends

摘要

In this work,the compatibility of blends of plasticized poly(vinyl chloride) (p-PVC) and thermoplastic polyurethane (TPU) was investigated using a dynamic mechanical analyzer and scanning electron microscopy.Two kinds of TPU with differ-ent ratios of hard to soft segments,i.e.,TPU90 nad TPU70 were compared.p-PVC/TPU90 and p-PVC/TPU70 blends with variable welght ratios (100/0,90/10,80/20,70/30,60/40,50/50,0/100)were prepared by melt blending.PVC was plasticized with 40 phr of dioctyl phthalate.It was found that TPU with a lower hard segment (i.e.,TPU70) is more compatible with plasticized PVC than TPU with a higher hard segment (I.E.,TPU90) in over the composition ranges examined.It was concluded that the compati-bility of plasticized PVC and TPU are dependent on the ratio of hard to soft segments in TPU.