単繊維の撚りによる長さ変化について

概要

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An isotropic mono-filament of synthetic polymer elongates with twisting, and more elongation occurs by untwisting　On the twisting of a 6-nylon isotropic mono-filament, the change of elongation, twisting moment, twist angle, X-ray diagram, birefringence, and stress-strain curve are measured.　As a result of measurement. it is conceivable that the twist deformation occurs through three processes. The 1st procces is the nearly elastic deformation. The 2nd process contains the orientation of amorphous region and the slippage of lamerae in spherulites. In the 3rd process, the spiral-like structure transforms into the peculiar ribbon-like fibrils and twist deformation is increased by slippage of the fibrils　When the sample is drawn, the elongation by twist decreases and finally it turns to contraction. This phenomenon may suggests that the oriented region in the fiber grows with drawing and the contraction increases by the twist of the oriented part.　Other polymers, Polyethylene, Polypropylen, Polyethyleneterephthalate, Polyvinyl-alcohol and rubber, are measured by simillar way. Their twisting properties are essentially the same as those ot 6-nylon.
山形大学の論文
1967-01-20