The appearance of non‐linear viscoelasticity in polyethyl methacrylate has been studied in pure shear by means of periodic, square and triangular stress functions. It is shown that the β‐transition gives a considerable contribution to the non‐linear behaviour and that an increase in the stress dependence appears in the time‐temperature region where the β‐mechanisms are expected to act.
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Jan‐Fredrik Jansson (1974) studied this question.
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