Abstract
The torsional creep and creep recovery behavior of a high molecular weight (Mw=6.5×105) poly(vinyl acetate) is reported for the temperature range, 37.5°C to 154°C. The results for the recoverable compliance, Jr(t), reveal the usual two dispersions seen between glassy and steady state behavior. The intermediate rubbery plateau compliance, JN, has a value of 2.8×10−7 cm2 dyn−1, reflecting a molecular weight per entangled unit of 8,500. Though the specimen studied was a fraction, the terminal dispersion was extensive. The steady-state recoverable compliance, Je°, was approximately 80 times larger than JN. Because there was considerable information on the terminal dispersion, it was possible to independently determine its temperature dependence, which was found to be indistinguishable from that of the viscous deformation. However, this temperature dependence is significantly different from that of the softening dispersion. The differences observed are in the same sense as that found previously for the softening dispersion and viscous flow dependences of polystyrene.
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Plazek, D. The Temperature Dependence of the Viscoelastic Behavior of Poly(vinyl acetate). Polym J 12, 43–53 (1980). https://doi.org/10.1295/polymj.12.43
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DOI: https://doi.org/10.1295/polymj.12.43
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