Strong Attractive Interaction between Ethylene Ionomer and Carboxyl Groups of Styrene-Co-Methacrylic Acid

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  • Takaki Mei
    Graduate School of Science and Engineering, Yamagata University
  • Koda Tomonori
    Graduate School of Organic Materials Science, Yamagata University
  • Haba Osamu
    Graduate School of Organic Materials Science, Yamagata University
  • Nishio Taichi
    Graduate School of Organic Materials Science, Yamagata University
  • Miyata Ken
    Graduate School of Organic Materials Science, Yamagata University
  • Nishioka Akihiro
    Graduate School of Organic Materials Science, Yamagata University

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Abstract

<p>Effects of styrene-co-methacrylic acid (StMAA) on melt viscosity and morphology for ethylene ionomer were studied. In this study, we used poly-(ethylene-co-methacrylic acid) of neutralization degree 54 % with sodium ions (EMAA-54Na). Dynamic viscoelasticity of EMAA-54Na/polystyrene(PS) or EMAA-54Na/StMAA blends was evaluated. EMAA-54Na/StMAA blends differed from EMAA-54Na/PS blends in rheological property. Zero shear viscosity η0 of EMAA-54Na/StMAA was higher than expected viscosity with increasing contents of StMAA. Furthermore, fall down of the damping function obtained from stress relaxation measurement of EMAA-54Na/StMAA was weaker than that of EMAA-54Na. These results indicated strong interaction between EMAA ionomer and carboxyl groups of StMAA. Results of morphological observation and Fourier transform infrared spectroscopy also indicated that the strong interaction is attractive.</p>

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