Cast elastomers and Their Properties

The experimental details on the cast elastomers prepared using Baytec MS-242 and Baytec ME-050 prepolymers and their physical, mechanical and dynamic mechanical properties are given in Tables 8.10 and 8.11. 

In the case of poly(ester urethanes), HER and HQEE extended elastomers showed comparable tensile, tear, glass transition temperature (T ) and hysteresis (tan 8) properties. Compared to HER, HQEE extension produced elastomer with about 2 Shore-D units higher hardness. An improvement in the tensile strength value was observed for the HER/HQEE blend at 25 75 weight ratio. In general, all the physical and mechanical properties were slightly affected or lowered with HER/HQEE blends compared to either HER or HQEE extended material. 

In the case of poly(ether urethanes), HQEE extended elastomer had slightly higher hardness, tensile strength and tear strength values than the HER extended material. HER extension produced elastomer with a lower compression set compared to HQEE extension. 

DMA properties of HER and HQEE extended elastomers are similar. All the other physical and mechanical properties of the elastomers from the HER/HQEE blends were lower than the HER or HQEE extenders. 

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