Abstract
The present study focused on the effects of the addition of lithium salts such as LiI, LiBr and LiCl on the rheological properties of aqueous solutions containing 15 wt% poly(vinyl alcohol) (PVA). There was a plateau in the shear storage modulus in the low frequency region, demonstrating that such solutions have a network structure attributed to hydrogen bonding of the PVA. The value of the plateau modulus evidently decreased with temperature and with the addition of lithium salts. The experimental results also demonstrated that the anion species in the salt plays an important role in determining the rheological properties, including the magnitude of the plateau modulus. The iodide anion, which is classified as a “water-structure-breaker” ion in the Hofmeister series, effectively decreased both oscillatory shear moduli including the plateau modulus. However, the effect of adding LiI decreased at high temperatures, owing to the reduced extent of hydrogen bonding.
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Acknowledgements
This study was supported by COI program of JST, “Construction of next-generation infrastructure system using innovative materials.” Realization of safe and secure society that can coexist with the earth for centuries. The authors appreciate Mr. Naoya Tsugawa of Tosoh Analysis and Research Center Co., Ltd. for his technical support of the EMS viscometer measurements.
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Saari, R.A., Maeno, R., Tsuyuguchi, R. et al. Impact of Lithium halides on rheological properties of aqueous solution of poly(vinyl alcohol). J Polym Res 27, 218 (2020). https://doi.org/10.1007/s10965-020-02198-y
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DOI: https://doi.org/10.1007/s10965-020-02198-y