Crystallinity in Hydrolytically Aged Polyester Polyurethane Elastomers

Brown, Daniel W.; Lowry, Robert E.; Smith, Leslie E.

doi:10.1021/bk-1979-0095.ch010

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1980

1992

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“…Lifetime prediction tests based on changes in physical properties can be misleading because of the reinforcing effect of crystals which form from degraded, lower molecular weight fragments [3]. More reliable tests based on specific molecular mechanisms are therefore desirable for critical uses of these materials.…”

Section: Introductionmentioning

confidence: 99%

“…Polyester-based urethane elastomers degrade in moist air, sometimes reverting to viscous liquids.1,2 Lifetime prediction tests based on changes in physical properties can be misleading because of the reinforcing effect of crystals which form from degraded, lower molecular weight fragments. 3 More reliable tests based on specific molecular mechanisms are therefore desirable for critical uses of these materials. Schollenberger and Stewart showed that the degradation involved the acid-catalyzed hydrolysis of the ester linkage.…”

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confidence: 99%

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