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Fourier‐transform infrared measurements on atactic polystyrene have been made during application of strain. On passing through the yield point, spectra indicate an increase of the amount of the higher‐energy gauche conformation corresponding to the conformational distribution observed at 30°C above the glass transition. The trans conformation recovers after yield. The results are in agreement with the theory of Robertson but do not allow the validity of his model to be unambiguously established.
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Theodorou et al. (1985) studied this question.
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