1996 Fiscal Year Final Research Report Summary
Dynamiccal Theory of Gelation Process
| Project/Area Number |
07805086
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Nagoya University |
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Principal Investigator |
DOI Masao Nagoya University, Faculty of Engineering, Professor, 工学部, 教授 (70087104)
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA Keiji Nagoya University, Faculty of Engineering, Assistant, 工学部, 助手 (90023142)
MATSUMOTO Mitsuhiro Nagoya University, Faculty of Engineering, Assistant Professor, 工学部, 助教授 (10229578)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Gelation / Gel-Sol Transition / Simulation / Bridging Reaction / Structure Formation / 構造形成 |
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| Research Abstract |
Gelation is a phenomena that a material transforms from a fluid state (the state that flows under infinitesimal strees) to a solid state (the state that cannot flow). The phenomena has been identified as the formation of an infinite network, and has often been discussed in the framework of the percolation theory, where it has been studied when and how an infinite network is formed when monomers or bonds are placed randomly on a lattice \ cite {Family}. However, in such set up of the problem the actual molecular dynamics is not taken into account.
Tostudy the structural evolution associated with gelation, we performed a computer simulation for the gelation process of telechelic polymers which have two reaction sites (stickers) at both ends of the chain. We assume that (i) when stickers contact with each other, they form a cluster and move together then after, and that (ii) there is a maximum number of stickers in the cluster. The structural evolution of the system before and after the gelation point is studied.It is found that (i) as the gelation proceeds, a large concentration inhomogeneity is created as in the case of spinodal decomposition, (ii) this structural evolution take place very slowly over the period long after an infinite network is formed, and (iii) the structural evolution is stopped by the elastic effect of the network.
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