アイソタクチック・ポリブテン-1のレジームⅡ－Ⅲ転移とキネティックラフニング転移

抄録

  The lateral growth rate and growth shape morphology of isotactic polybutene-1 (iPB1) tetragonal crystals were investigated for crystallization from the melt over the temperature range 68–101℃. The growth rate of tetragonal crystals shows supercooling dependence predicted by surface nucleation theory, and a regime II-III transition is observed at temperatures of 77–82℃. The morphology of single crystals is rounded below temperatures of 77–80℃, while the growth shape has a faceted morphology at higher crystallization temperatures. The kinetic roughening transition occurs between 77 and 80℃. The regime II growth mode is observed above 82℃ and proceeds by multiple nucleation on the faceted growth front, while the regime III growth mode is observed below 77℃ and proceeds by rough surface growth on the kinetically roughened growth front. The observed regime II-III transition can therefore be explained by the morphology transition of crystal growth shape.