2001 Fiscal Year Final Research Report Summary
Primary Structure of Polyethylene Copolymers and Dominant Factors of Gelation
| Project/Area Number |
12650891
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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 | Kanagawa Institute of Technology |
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Principal Investigator |
OKABE Masaru Kanagawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (00121228)
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| Project Period (FY) |
2000 – 2001
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| Keywords | thermoreversible gel / ethylene / propvlene copoymer / ethylene / 1-hexene copolymer / junction size of gel / polyethylene / gel-melting temperature / Flory-Huggins interaction parameter / Markov statistics |
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| Research Abstract |
A linear low-density polyethylene (LLDPE) in organic solvents (such as decane, cyclopentane, and toluene) converts to thermoreversible gel near room temperature. The junction point size ζ in number of ethylene units per crystalline sequence was estimated as a function of number of short-chain branching (SCB) as well as the Flory-Huggins interaction parameter X 12 between polymer and solvent. Moreover, weight-average length in number of consecutive ethylene units L(E)w was estimated from ^<13>C NMR measurement assuming the Markov process and the size ζ was compared with the primary structure length L(E)w. The following facts were obtained:
1. The junction point size ζ became larger than the length L(E)w when the gel was prepared in a poor solvent. While, the size ζ was nearly equal to the length L(E)w with decreasing % u parameter.
2. The size ζ decreased with increasing SCB, and increased with increasing 12 parameter
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