1996 Fiscal Year Final Research Report Summary
Elucidation of Higher Order Structure of Coals from Their Viscoelasticity Behavior
| Project/Area Number |
07455317
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Tohoku University |
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Principal Investigator |
IINO Masashi Institute for Chemical Reaction Science, Tohoku University, Professor, 反応化学研究所, 教授 (10006306)
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| Co-Investigator(Kenkyū-buntansha) |
TAKANOHASHI Toshimasa Institute for Chemical Reaction Science, Tohoku University, Research Associate, 反応化学研究所, 助手 (30197123)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Coal / Higher Order Structure / Gel Film / Viscoelasticity |
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| Research Abstract |
A large amount of solvent-soluble constituents of coals were mildly extracted with a carbon-disulfide-N-methyl-2-pyrrolidinone mixed solvent at room temperature. Various gel films containing a solvent was successfully prepared by using the solvent-soluble constituents and polar solvents such as N-Methyl-2-pyrrolidinone and N,N-dimethyl-formamide.
A thermomechanical analysis (TMA) of the gel films was carried out and the creep compliance behaviors of the gel films showed the viscoelastic properties, suggesting that the gel films have higher order structure which mainly consist of physical cross-linked networks through coal-coal interaction and coal-solvent interaction, since the solvent-soluble constituents have little original covalent cross-links. When the weight fraction of solvent inthe gels was decreased, the viscous strain and the viscoelastic strain decreased, while the elastic strain was almost unchanged, suggesting no participation of a solvent.
As a next step, the comparison of the viscoelastic behavior between an extract (this study) and residue from the same coal is needed to further clarify higher order structure (network structure) of coal.
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