Structure and Properties of Ionomers Based on Ethylene-Co-Methacrylic Acid Copolymer (Emaa)

Abstract

Fourier-transform infrared spectra (FTIR) measurement was made on zinc and sodium ionomers (EMAA-Zn and EMAA-Na) of ethylene-co-methacrylic acid copolymer. It was found that the asymmetry stretching vibration peak of CO bond of COO-group in ion aggregates of EMAA-Na appeared at lower wavenumber, compared with EMAA-Zn. This means that complete and stable ion aggregates exist in EMAA-Na. Differential scanning calorimetry (DSC) measurement showed that endotherm peak (T1) in lower temperature range resulted from melting of subcrystallites of crystalline ethylene in EMAA and EMAA ionomers. Tensile properties and dynamic viscoelasticity of EMAA greatly changed with the introduction of ionic groups.

Uniaxial Elongational Viscosities of Ethylene Ionomer / Styrene-co-Methacrylic Acid Blends

“…3) 一方，Znタイプのアイオ ノマーでは，普通4配位4面体型の配位構造を形成する．これ はZn金属1個あたり4個の酸素原子が配位できることを意味 するが，Zn金属は2価のイオンであることから，イオン結合 するカルボキシレート（-COO-）だけで，それ以外のものは 配位できない． 10-11), [22][23][24] 以上のことから，本研究の結果を考えると，イオン凝集体 内に未中和カルボン酸が配位し，入り込める可能性があるの は，EMAA-54Na にStMAAをブレンドした時のみである．こ のことから判断すると，未中和のカルボン酸を含むStMAAは …”

Compatibilization of an immiscible blend of EPDM and POM with an Ionomer

“…These ionomer related peaks (Figure 5 and the peak at 1584 cm −1 is related to the asymmetric stretching vibration of the C−O bond in tetra-coordinated zinc carboxylates. [90][91][92] FTIR measurements confirmed that there is an interaction between the ionomer and the other components of the blend. In particular a slight shift to higher wavenumber for C-O vibrations of POM (indicated by the symbols * and @ in Figure 6(d)) and of Zn 2+ ionomer due to the interaction between the pedant ions of EMAA-Zn 2+ and the dipoles of POM was detected.…”

“…It can be seen that there are peaks present due to the presence of the ionomer. These ionomer related peaks (Figure 5(d)), such as those at 1734 and 1697 cm −1 are ascribed to ester carbonyl group and carboxylic acid group, and the peak at 1584 cm −1 is related to the asymmetric stretching vibration of the C−O bond in tetra‐coordinated zinc carboxylates 90–92 . FTIR measurements confirmed that there is an interaction between the ionomer and the other components of the blend.…”