The relationship between the diffusion behavior and the solvent induced crystallization (SINC) was investigated. We have also studied the crystalline structures of PEN crystallized by solvent and compared them with those of thermally crystallized PEN. The diffusion behavior of dioxane at 408C and 608C is not pure Fickian but apparent Fickian where diffusion is controlled by crystallization. The diffusion behavior at 258C is also not pure Case II. The diffusion behavior in DMF is similar to that in dioxane. The samples treated in dioxane above 408C, which show the Fickian diffusion behavior, exhibit a-crystal and spherulitic texture. The sample treated in dioxane at 258C, which show the Case II diffusion behavior, mainly exhibits b-crystal and the amoebae structure. The samples treated with DMF mainly show the a-crystal, irrespective of treatment temperature. The change of diffusion behavior by varying the treatment temperature affects the crystallization conditions, and crystalline form in SINC is changed by the characteristic of solvent.
Посилання на статтю:
Solvent induced crystallization behavior of poly(ethylene 2,6-naphthalate) film / Sung-Joong Kim, Joo-Young Nam, Young-Mok Lee, Seung-Soon Im // Polymer. – 1999. – N 40. – P. 5623–5629.