Stress Relaxation under Large Step Strain for Ionomers Based on Ethylene-co-Methacrylic Acid Copolymer in the Melt State.

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  • ZENG X. S.
    Department of Polymer Science and Engineering, Kyoto Institute of Technology, Maytsugasaki, Sakyo–ku, Kyoto 606–8585, Japan
  • TAKAHASHI M.
    Department of Polymer Science and Engineering, Kyoto Institute of Technology, Maytsugasaki, Sakyo–ku, Kyoto 606–8585, Japan
  • YAMANE H.
    Department of Polymer Science and Engineering, Kyoto Institute of Technology, Maytsugasaki, Sakyo–ku, Kyoto 606–8585, Japan
  • MASUDA T.
    Department of Material Chemistry, Kyoto University, Kyoto 606–8501, Japan

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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+.

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