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Chain Extender and Diisocyanate Amount Effects on the Thermal, Mechanical and Wettability Properties of Some Polyurethane Elastomers

Abstract The aim of this study was to investigate the effect of chain extender and diisocyanate amount on the thermal, mechanical and wettability properties of some polyurethanes. The chain extender nature caused the increase of the thermal stability due to the higher stability of the double and triple bonds respectively in contrast to simple bonds. Tg of the polyurethanes based on PCL/MDI decreased when the unsaturated grade from chain extenders increased. The double and triple bonds content from polyurethane structure was responsible for this behavior. The hard segment contents and the chain extenders nature also influenced the wettability. The results showed that the thermal, mechanical and wettability properties of the final products might be controlled by fine control of the amount of the MDI and the nature of the chain extenders