Fourier‐transform infrared measurements on atactic and amorphous isotactic polystyrenes have been made during application of strain. On passing through the yield point, spectra indicate an increase of the amount of higher‐energy conformation. In atactic polystyrene it corresponds to an increase of gauche conformations whatever the state may be: pure or plasticized samples, blend with another compatible polymer, or styrene‐acrylonitrile copolymer. In amorphous isotactic polystyrene an increase of higher‐energy trans conformation is observed. These results strongly support the theory developed by Robertson to explain plastic deformation of polymers.
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Xu et al. (1989) studied this question.
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