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A statistical theory applicable to crystals of helical-chain molecules is developed in terms of the mean-field approximation; interchain potential energy which contains terms relevant to the screw displacements along the chain axis is taken into account. Simultaneous equations of complex variables describing states of the system are obtained; they are solved in several limited cases. Successive phase transitions observed in polytetrafluoroethylene crystals with increasing temperature at atmospheric pressure can be explained from the results.
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Takao Ishinabe (1978) studied this question.
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