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Poly(vinyl chloride): Effect of molecular weight and vapor environment on viscoelastic and fatigue properties
Author(s) -
Martin John R.,
Johnson Julian F.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070181104
Subject(s) - viscoelasticity , crazing , materials science , polyvinyl chloride , composite material , plasticizer , loss factor , creep , vinyl chloride , dynamic modulus , nitrogen , dynamic mechanical analysis , polymer , chemistry , organic chemistry , dielectric , optoelectronics , copolymer
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 M w was raised by a factor of five.