Stress Relaxation under Large Step Strain for Ionomers Based on Ethylene-co-Methacrylic Acid Copolymer in the Melt State
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概要
- 論文の詳細を見る
Stress Relaxation behavior under large step shear strain γ for ethylene-co-methacrylic acid copolymer (EMAA) and its ionomers (EMAA-Zn and EMAA-Na) was studied in the melt state. EMAA ionomers show higher relaxation modulus G(t, γ) and slower relaxation rate than EMAA. At 140°C the strain dependence of G (t, γ) for EMAA ionomers is very strong. The corresponding damping function h(γ) decreases with γ in two steps around γ=0.6 and γ=4. This suggests that the ion aggregates become small in two steps. However, at 200°C h(γ) monotonically decreases with γ, indicating that the ion aggregates are already small and become smaller monotonically with increasing γ. Compared with EMAA-Na, EMAA-Zn has higher stress relaxation modulus because of strong interactions due to cooperation between the carboxyl acid group and Zn2+.
- 日本レオロジー学会の論文
著者
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Takahashi M.
Department of Physics, Okayama University
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升田 利史郎
京都大学大学院工学研究科材料化学専攻
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Masuda T
Kyoto Univ. Kyoto Jpn
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MASUDA T.
Department of Applied Physics, The University of Tokyo
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ZENG Xiangsheng
Department of Polymer Science and Engineering, Kyoto Institute of Technology
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Takahashi Masaoki
Department Of Macromolecular Science And Engineering Kyoto Institute Of Technology
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YAMANE H.
Department of Polymer Science and Engineering, Kyoto Institute of Technology
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ZENG X.
Department of Polymer Science and Engineering, Kyoto Institute of Technology
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Yamane Hideki
Department Of Polymer Science And Engineering Kyoto Institute Of Technology
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YAMANE H.
Division of Advanced Fibro-Science, Kyoto Institute of Technology
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Yamane H.
Division Of Advanced Fibro-science Kyoto Institute Of Technology
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