抄録
(Part 2) The temperature dependence of the two kinds of polyvinyl chloride (PVC), polymerized at different temperature on the tensile strength, was measured at various extention ratios. At the initial stage of extention, an anormalous range was observed where the entropy as well as the internal energy are increased. With PVC polymerized at lower temperature, this range is observed to be wider and the change of each component of the tension caused by drawing is larger as compared with ordinary PVC.
The density measured at each step corresponds well with the entropy and the internal energy change. The density of the sample decreases by drawing it within the anormalous range and then it increases abruptly after the anormalous range is surpassed.
Considering the above facts, when PVC is subjected to drawing, the partial break down of the initially existed net work occurs first, and this is succeeded by the recombination and reconstruction of a new net work and thus result into a stable fibre structure. The initially existed net work which has to be broken down at the initial stage of drawing seem to be much dense in PVC sample prepared at lower temperature than in the ordinary PVC.
