Poly(Vinyl chloride): Viscoelastic and fatigue properties as a function of molecular weight in ethanol vapor

Authors

  • John R. Martin,

    1. Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06268
    Current affiliation:
    1. Foxboro Company, Research Department, Foxboro, Massachusetts 02035
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  • Julian F. Johnson

    1. Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06268
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  • Part II of a series on Molecular Weight-Mechanical Property Interrelationships.

Abstract

Viscoelastic fatigue studies were made on poly(vinyl chloride) (PVC) films using oscillatory loading on prestressed samples in an ethanol vapor environment. Samples include unfractionated PVC, relatively narrow molecular weight distribution fractions, and blends made from the fractions. Strain, complex modulus, and tan δ were studied as a function of time until rupture occurred. A marked dependence on molecular weight was observed, for example, a fraction with M̄w = 51,000 failed in a few seconds, while one with M̄w = 228,000 did not fracture after 1600 min.

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