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Effect of the Mg2+ ratio on the mechanical and self-healing properties of polyisoprene ionomers co-neutralized with Na+ and Mg2+

Polymer Journal (2024)Cite this article

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Abstract

The effect of the ratio of divalent (Mg2+) to monovalent (Na+) cations on the mechanical and self-healing properties of polyisoprene (PI) ionomers co-neutralized with Na+ and Mg2+ was studied. Sodium carboxylates link polymer chains via electrostatic interactions, while magnesium carboxylates more strongly link polymer chains via ionic bonds. Therefore, Mg2+ considerably reinforces the PI ionomer. However, we found that the mechanical properties of the PI ionomers did not change proportionally to the ratio of Mg2+. The ionomer was significantly reinforced at over 25% of the Mg2+ ratio, where linkage via Mg2+ in the network was prevalent throughout the material. At the same time, the self-healing of the PI ionomer was disrupted.

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Acknowledgements

The beam time at PF-KEK provided by Programs 2019G116, 2020G610, and 2021G573 is acknowledged herein. The generous allotment of computational time from the Research Center for Computational Science, Okazaki, Japan (Project No: 23-IMS-C25 to TU), is also gratefully acknowledged. This research was financially supported by JSPS KAKENHI (grant numbers 19K05612 (YM) and 22H02141 (YM)), JST, PRESTO (grant number JPMJPR199B (YM)), and the OGAWA Science and Technology Foundation.

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Authors and Affiliations

  1. Materials Chemistry Course, Department of Materials Science and Processing, Graduate School of Natural Science and Technology, Gifu University, Yanagido, Gifu, 501-1193, Japan

    Rina Takahashi

  2. Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu, 501-1193, Japan

    Taro Udagawa, Kei Hashimoto, Shoichi Kutsumizu & Yohei Miwa

  3. PRESTO, Japan Science and Technology Agency, Kawaguchi Center Building 4-1-8, Honcho, Kawaguchi, Saitama, 332-0012, Japan

    Yohei Miwa

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  1. Rina Takahashi
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  4. Shoichi Kutsumizu
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  5. Yohei Miwa
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Correspondence to Yohei Miwa.

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Takahashi, R., Udagawa, T., Hashimoto, K. et al. Effect of the Mg2+ ratio on the mechanical and self-healing properties of polyisoprene ionomers co-neutralized with Na+ and Mg2+. Polym J (2024). https://doi.org/10.1038/s41428-024-00907-8

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