Study on the Entanglement Effect between Topologically Different Polymer Chains
| Project/Area Number |
60470107
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
KOTAKA Tadao Faculty of Science, Osaka University, Professor, 理学部, 教授 (20027022)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Hiroshi Faculty of Science, Osaka University, Research Associate, 理学部, 教務職員 (90167164)
ADACHI Keiichiro Faculty of Science, Osaka University, Assistant Professor, 理学部, 助手 (00028226)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1985: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Viscoelasticity / Dielectric relaxation / Dielectric normal modes process / Relaxation time / Homopolymer blend / Block polymer / homopolymer blend / Star polymer / linear polymer blend / Entaglement effect / 架橋高分子 |
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| Research Abstract |
To understand the nature of entanglement governing physical properties of condensed polymer systems, we examined the relaxation behavior of 1) binary blends of monodisperse polystyrenes of different molecular weight, 2) styrene-butadiene block polymer micelles dispersed in polybutadiene matrix, 3) blends of linear/4-arm star polystyrenes, and 4) natural rubber networks with entrapped cis-polyisoprene, employing viscoelastic and dielectric spectroscopy. Utilizing one of the components such as, for example, 1) the high molecular weight component. 3) the star-chains, and 4) the entrapped free chains as a probe, we determined the relaxation time and its distribution of the probes as a function of molecular weight and composition of the systems.
Realizable relaxation modes are determined by relative length of the characteristic times of the probes and matrix chains confining the probes. Thus, we could separately evaluate the elementary relaxation processes of the probes: In terms of the "tube" theory, they are repatation, tube renewal, and path breathing modes. In usual bulk polymer systems, these modes take place si-multeneously in a competitice manner and thus unseparable. However, by the present methods utilizing a probe component, we could separately evaluate and interprete in molecular terms the relaxation processes involved in the systems. Thus, we could clarify the features of the effect of entanglement on the dynamics of flexible polymer chains in the condensed systems. In industrial application, these knowledges will provide important clues to design processing conditions and properties of end-products such as high-impact plastics.
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Report
(1 results)
Research Products
(10 results)
