2002 Fiscal Year Final Research Report Summary
Molecular Rheology of Amorphous Polymers Studied with Electric Birefringence
| Project/Area Number |
13450391
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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 |
高分子構造・物性(含繊維)
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
WATANABE Hiroshi Kyoto University, Insatiate for Chemical Research, Prof., 化学研究所, 助教授 (90167164)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Tadashi Kyoto University, Institute for Chemical Research, Inst., 化学研究所, 助手 (80201937)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Electric Birefringence / Viscoelasticity / Glass Transition / Dielectric Dispersion / Molecular Rheology / Polystyrene / Stress-Optical Rule |
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| Research Abstract |
Electric birefringence (Kerr effect) of polystyrene melts (molecular weight 10500 and 1050) was measured under low electric field in the frequency range of 0.1 - 105 Hz at various temperatures near and above the glass transition temperature. Frequency-temperature superposition was applicable to obtain a composite curve. A weak dispersion of the complex Kerr coefficient was observed in the glass transition zone of the viscoelastic relaxation spectrum. The time evolution of the electric birefringence was found to be in accord with the relaxation of the "strain-induced" birefringence originated by main chain orientation after step strain. Similar measurement were also performed on polyisoprene having permanent type-A dipole. A dispersion due to the permanent dipole was observed in the terminal flow region of the Kerr coefficient and could be correlated the dielectic dispersion.
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