title: Concentric ring pattern formation in a competing crystallization and phase separation process.
abstract: 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.
authors: Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
authors: Weichao
authors: W
authors: Shi
authors: He
authors: H
authors: Cheng
authors: Fenghua
authors: F
authors: Chen
authors: Yongri
authors: Y
authors: Liang
authors: Xuming
authors: X
authors: Xie
authors: Charles C
authors: CC
authors: Han
mesh_terms: D003460:Crystallization; D044367:Phase Transition; D011092:Polyethylene Glycols / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*
chemical_list: D011092:Polyethylene Glycols; D019904:Polymethyl Methacrylate