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Morphology development and exclusion of noncrystalline polymer during crystallization in PVDF/PMMA blends |
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| Authors: | Yoshifumi Okabe Noboru Osaka Takashi Inoue |
| Affiliation: | a Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, Japan b Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan c Department of Polymer Science and Technology, Yamagata University, Jonan, Yonezawa-shi, Yamagata 992-8510, Japan |
| Abstract: | Morphology development during the crystallization of poly(vinylidene fluoride) (PVDF)/poly(methyl methacrylate) (PMMA) blends was investigated at various crystallization temperatures (TC) by means of time-resolved light scattering measurements and atomic force microscopy (AFM). A coarse spherulite obtained at a high TC of 162 °C was found to be developed with a two-step crystallization process. The ordering in the spherulites (Pr) increased with time at the early stages and then decreased at the later stages. The rate of spherulite growth started to decrease when Pr started to decrease. In contrast, in the compact spherulite obtained at a low TC of 148 °C, Pr decreased monotonously with time while the growth rate was constant. AFM observation revealed that such characteristic crystallization behavior is attributed to the exclusion of PMMA from the crystal growth during the crystallization; i.e., the amount of excluded PMMA becomes larger as the distance from the spherulite center increases and the crystallization temperature rises. |
| Keywords: | Light scattering Atomic force microscopy Crystallization |
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