Rotator and melting transition in paraffins

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Abstract
A theory of the melting of paraffins is developed based on dislocation theory. The transition from two- to three-dimensional melting behavior, when proceeding from the small-to large-chain limit, is qualitatively described by this theory. It also yields a tentative explanation of the tendency of large-chain polymer crystals to crystallize in a folded structure. The structural properties of the paraffin lamellae above the rotator transition and below the melting point are studied by considering vortex loop defects. The geometrical implications of the motion of vortex and dislocation loops on the lamellar structure is studied, and a roughening of the surfaces of the lamellae is predicted. The possibility of a nematic ordering of the melt is discussed.

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