Properties of linear elastomeric polyurethanes

Authors

  • Stuart L. Cooper,

    1. Textile Research Institute, Princeton, New Jersey, and Departments of Chemistry and Chemical Engineering, Princeton University, Princeton, New Jersey
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  • Arthur V. Tobolsky

    1. Textile Research Institute, Princeton, New Jersey, and Departments of Chemistry and Chemical Engineering, Princeton University, Princeton, New Jersey
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Abstract

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 Tg, unaccounted for by either crosslinking or crystallinity. Various experiments including incorporation of plasticizes of widely varying chemical composition have suggested interpretation of the system as a block copolymer, each block having its own Tg. Each of the two types of blocks seems to associate with similar blocks from other molecules.

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