In order to supplement the dynamical investigation of the secondary absorption region of polymethyl methacrylate, which appeared at 20°C in \(1/2\) cps vibration measurement as described in the previous report, the torsional creep was observed at various temperatures from -50°C to 30°C. Assuming that this polymer is "thermorheologically simple", the master creep curve was constructed, and the activation energy of 30 kcal/mol was obtained.
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Sato et al. (1954) studied this question.
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