PROPERTIES OF LINEAR ELASTOMERIC POLYURETHANES.
FRICK CHEMICAL LAB PRINCETON UNIV N J
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The viscoelastic properties of some polyester-urethanes are compared with the properties of other polymers. The behavior observed is anomalous in that these polyurethanes exhibit an unusually high value of modulus well above their T sub g, unaccounted for by either crosslinking or crystallinity. Various experiments including incorporation of plasticizers of widely varying chemical composition have suggested interpretation of the system as a block copolymer, each block having its own T sub g. Each of the two types of blocks seems to associate with similar blocks from other molecules. Author