Abstract
The effects of ions on the structures and properties of poly(vinyl alcohol) films were systematically studied using various metal salts. Although cations play an important role, the data obtained in this study demonstrated that the strong ion–dipole interactions between anions and poly(vinyl alcohol) chains also have a significant impact on crystallinity and glass transition temperature. For the first time, the study revealed that the impact of the added salts follows the Hofmeister series. Investigations of various bromine salt cations revealed that Li+ is more effective at disrupting the water structure than either Na+ or K+. Further experiments using lithium salts with various anion species verified that lithium salts play an important role in determining the crystallinity and hydrogen bonding within aqueous poly(vinyl alcohol) and therefore affect the dynamic mechanical properties of films. This phenomenon clearly follows the order LiClO4 > LiI > LiBr > LiNO3 > LiCl, which corresponds to the Hofmeister series.
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Acknowledgements
This study was supported by the COI program of JST (JPMJCE 1315), “Construction of next-generation infrastructure system using innovative materials.” Realization of safe and secure society that can coexist with the earth for centuries.
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Saari, R.A., Nasri, M.S., Marujiwat, W. et al. Application of the Hofmeister series to the structure and properties of poly(vinyl alcohol) films containing metal salts. Polym J 53, 557–564 (2021). https://doi.org/10.1038/s41428-020-00450-2
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DOI: https://doi.org/10.1038/s41428-020-00450-2