On the Rotational Transition of Crystalline Polymers

Abstract

For discussing the rotational transition in the crystalline region of linear polymers, e. g. polytetrafluoroethylene &c., the author developed an approximate theory, modifying the Hoffman's theory concerning the transition in normal paraffines and assuming that the energy needed for transforming the chain segment from static state to rotating state is proportional to α-power of the fraction x residing in static state of the total number of segments. For discussing the nature of this approximate theory, he showed its correspondence to the theory of Bethe-Takagi approximation taking account of the nearest neighbor interactions between segments lying along the molecular chain and standing side by side perpendicular to the chain, and he explained the physical meaning of α and investigated the pnactical conditions.