| Project/Area Number |
02302079
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性・高分子材料（含機械材料）
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| Research Institution | Yamagata University |
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Principal Investigator |
HIKOSAKA Masamichi Yamagata University, Associate Professor, 工学部, 助教授 (60087103)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAMIZAWA Kichiro Kyusyu University, Professor, 工学部, 教授 (10037707)
TODA Akihiko Kyoto Univeristy, Research Associte, 理学部, 助手 (70201655)
MIYAJI Hideki Kyoto University, Assoicate Professor, 理学部, 助教授 (90025388)
TANAKA Hajime The Univerisyt of Tokyo, Associate Professor, 生産技術研究所, 助教授 (60159019)
OHIGASHI Hiroji Yamagata University, Professor, 工学部, 教授 (90185372)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Crystallization / Chain sliding diffusion / Lateral growth / Thickening growth / Nucleus / Spherulite / Polymer / Epitaxial growth |
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| Research Abstract |
1) Crystalizathion from the melt : It is found that polymer single crystlas are formed through new thickening growth and well known lateral growth mechanisms. Thickening growth rate (U) increased with increase of degree of supercooling. These findings indicates that sliding diffusion of polymer chains takes important role in polymer crystallization mechanism. Crystallization temperature deyiendence of shape of single crystals was explained by competing of nucleation rate and traveling velocity of a nucleus.
2) Crystallization from the solution : Important role of absorption of polymer chains in crystallization and possibility of nucleation of three dimensional nucleus were shown.
3) Crystallization of spherulites : Origin of spherulite formation was explained by generation of screw dislocation induced by misfit between two sectors with differently oriented folds. Lateral growth rate at very high degree of supercooling was observed and it could not be well explained by conventional nucleation theory, which requires some new explanation.
4) Other studies : Co-crystallization and crystalization of multi-component system were studied, which showed that competition of crystallization and segregation of components reduces various morphologies. It is found that crystallization and subsequent solid-solid phase transformation introduces "frozed" defects within a crystal.
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