Concentric Ring Pattern Formation in a Competing Crystallization and Phase Separation Process

✍ Scribed by Weichao Shi; He Cheng; Fenghua Chen; Yongri Liang; Xuming Xie; Charles C. Han

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 818 KB
• Volume: 32
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.201100490

✦ Synopsis

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.