Photopolymerization Induced Directional Crystal Growth in Reactive Mixtures
Photopolymerization-induced crystallization has been demonstrated in blends of polyethylene oxide–diacrylate at temperatures above the depressed melting temperature of the crystalline component. Upon exposure to ultraviolet irradiation, the melting transition curve moves upward and eventually surpasses the reaction temperature, thereby inducing phase separation as well as crystallization. The present paper demonstrates the occurrence of directionally solidified interface morphologies of polymer crystals subjected to a photointensity gradient. The epitaxially grown seaweed or degenerate structures were observed at the circumference (low-intensity region) while the dense branched spherulites developed at the core high-intensity region.
Physical Review E
Park, Soo Jeoung; Rathi, Pankaj; and Kyu, Thein, "Photopolymerization Induced Directional Crystal Growth in Reactive Mixtures" (2007). Polymer Engineering Faculty Research. 938.