Concentric Ring Pattern Formation in a Competing Crystallization and Phase Separation Process
writer：Weichao Shi; He Cheng; Fenghua Chen; Yongri Liang; Xuming Xie; Charles C. Han*
keywords：concentric ring pattern, crystallization induced phase separation
source：期刊
specific source：Macromol. Rapid Commun. 32, 1886-1890, 2011.
Issue time：2011年
Spherulitic patterns usually form in the single process of crystallization in polymer blends.
But when phase separation intervenes under deep quench, the radial growth of the initial
spherulitic patterns tends to invert into concentric alternating crystalline-/amorphous-rich
ring structures. Within crystalline-rich regions, lateral lamellae orient in the tangential direction rather than in the usual radial direction. We demonstrate the determining factor for this first observed phenomenon is the concentration deviation enhanced phase separation dynamics at the growth interface of crystals.