抄録
The rate of strength change by drawing, cross-section change by heat drawing, and X-ray structure changes by draft, drawing and heat treatment were studied on the polyvinylchloride fiber which was prepared by wet-spinning of polyvinylchloride-Tetrahdrofuran solution.
The rate of strength change shows the maximum at the 400% drawing where the heat shrinkage also shows the maximum as reported already. The cross-section changes from symmetrical bean shape to the more flat bean shape passing through a stage of unsymmetrical bean shape like letter “B”, and their skin increases. Also the structure is shown in their core part when heat drawn.
No Change in degree of crystallization by draft is very low. It was observed that crystallization increases increasing draw-ratios under a constant draft, and the intensities of X-ray diffraction increase gradually on 5.38 Å and 3.87 Å. In the constant drawing, the degreeof crystallization is larger in case of higher draft fiber. By heat treatment, the degree of crystallization increases considerably and in the heat treatment under no tension, it is higher than the heat treated fiber under tension. But degree of orientation decreases in the heat treatment under no tension, and is almost the same as in the original fiber under the heat treatment with tention.
