Abstract
Viscoelastic and fatigue studies were made on polyvinyl chloride films using oscillatory loading on prestressed samples in dry nitrogen and nitrogen saturated with both water and ethanol vapor. Samples included unfractionated PVC, narrow molecular weight distribution fractions and blends made from the fractions. A combination of SEM photomicrographs and the viscoelastic data showed differences in crazing and plasticization in the different environments. Failure time, loss factor, creep and elastic modulus were all affected by some of the environments. Molecular weight was also a major factor in determining fatigue life as well as the mode of failure. For example rupture times were increased by four orders of magnitude when Mw was raised by a factor of five.
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