Infrared measurements of the dicroic ratio of poly‐(methyl methacrylate) absorption bands provide a valuable method for determining the orientation as well as the relaxation of chains during stretching. Different strain rates and temperatures of stretching were used. Orientation relaxation was determined and a master curve was obtained at a reference temperature TO = 135°C. The master curve shows that orientation relaxation behaves similarly to mechanical relaxation.
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Zhao et al. (1986) studied this question.
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