Direct observation of morphorogy during crystallization under shear flow
Kiyohito Koyama, Kiyohito Koyama, Kaori Watanabe
Yamagata University
Japan

Keywords: crystallization, spherulites, shear flow

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Crystallization process of polybutene-1 under low shear flow was observed by an optical microscope by
using a device newly developed by our group. The crystallization was observed at 102~108 °C under shear rates of up to 0.1s-1. Whirlpool shape of spherulites, having double layers, were unexpectedly discovered under slow uniform shear rates. These double layer whirlpool spherulites in the shear plane were growing by rotating as a function of time under shear.