Abstract
Molten polyethyleneadipate was spreaded on the slide-glass and cooled gradually at 27°C. And the growing process of the spherulite was observed under the polarization microscope between crossed nicols. At the first, small straight molecular bundles imerzed here and there. And they grow in three ways respectively, -i. e., (1) Some of them grow, but stay straight.(2) Some of them grow with the both ends spreading out.(3) The remainder of them grow with the ends spreading out until the outlines of them unite together. Then new radiating rientation occur around each type of these molecular bundles, and form spherulites. Acordingly these molecular bundles should be called the nuclei of spherulites. The types of nuclei are not essential. They seem only to owe to the surrounding temperature and the ension caused by original nuclei or small straight molecular bundles. The large spherulites a half inch in diameter were obtained by extremely gradual cooling from the melt. Someimes cracking occurred in the spherulites. The directions of the cracks were along to the radii, but exceptionally to the circle.
