Citation: XIAO Fengfei, ZHANG Xian, HU Shiru, MA Dezhu, LUO Xiaolie, XU Mao. COMPATIBILITY OF PVC WITH POLYURETHANES OF DIFFERENT SOFT SEGMENTS[J]. Chinese Journal of Polymer Science, ;1988, 6(1): 84-96. shu

COMPATIBILITY OF PVC WITH POLYURETHANES OF DIFFERENT SOFT SEGMENTS

Received Date: 20 May 1987

Blends of PVC and polyurethanes with four different soft segments of molecular weight 1000 were prepared and studied by dynamic mechanical and DSC techniques. It was found that the compatibility of PVC with segmented polyurethanes was related to the mixing of PVC molecules and the soft segments of the polyurethanes. Polyester based polyurethanes are more compatible with PVC than polyether based polyurethanes. Solution cast blends of PVC with PCL-polyurethane (1/2/1) exhibit single and narrow glass transition,while the blends with PPO-polyurethane(1/2/1)are completely incompatible.The compatibility was found to decrease with increasing hard segment content for all the polyurethanes used.The methods of blend preparation may change the compatibility of PVC/PU blends through their influence on the mixing or demixing of the hard and soft segments.
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