The limits of linear viscoelasticity in poly(methyl methacrylate) and poly(ethyl methacrylate)
- 1 July 1975
- journal article
- research article
- Published by Wiley in Journal of Applied Polymer Science
- Vol. 19 (7) , 1971-1978
- https://doi.org/10.1002/app.1975.070190717
Abstract
The limit of linear viscoelasticity is determined for poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA) in uniaxial tension creep over the temperature range of 20° to Tg −10°C. The time span covered is from 10 to 1000 sec. The linear limit is defined as the point at which the creep compliance deviates by more than 1% from its mean value in the linear viscoelastic range. For both materials, the stress limit of linear viscoelasticity falls to a minimum or plateau level at a temperature below Tg. It is suggested that the β‐mechanism plays an important role in the existence of this minimum.Keywords
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