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Effect of K ‐value on the tensile yield properties of poly(vinyl chloride)
Author(s) -
Havriliak S.,
Shortridge T. J.
Publication year - 1989
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.1989.070371004
Subject(s) - viscoelasticity , materials science , yield (engineering) , ultimate tensile strength , activation energy , vinyl chloride , composite material , polyvinyl chloride , methyl methacrylate , stress (linguistics) , compression (physics) , polymer chemistry , polymer , chemistry , linguistics , philosophy , monomer , copolymer
Tensile measurements were made on milled compression molded test specimens of PVC of different K values from strain rates of 0.0001–0.1 s −1 and temperatures of −40 to 25°C. The dependence of yield stress on temperature and strain rate was treated in terms of the Ree–Eyring model as proposed by Roetling for poly(methyl methacrylate) and Bauwens‐Crowet et al. for poly(vinyl chloride). The data reduction was achieved using sophisticated and unbiased statistical techniques that not only provided parameter estimates but their confidence intervals. The yield stress parameters for the alpha and beta processes were found to be independent of K value and within experimental error the same as those reported by Bauwens‐Crowet et al. The activation energy for the beta process from these yield stress studies (15.1 ± 0.3 kcal) is within experimental error the same as that determined from viscoelastic measurements (14.1 ± 1.2 kcal) reported by the authors. This observation supports the contention that beta process in the viscoelastic and yield stress measurements are closely related mechanisms.