Summary
Drying and water uptake of poly(acrylic acid) sodium salts with different degrees of neutralization were studied. The slowing down of drying speed in solid state was not due to Tg but due to the difficulty of the release of water molecule bound to two metal carboxylates or carboxyls. The equilibrium water uptake remained almost constant below 33 % neutralization, whereas it increased linearly with neutralization beyond 33 %. This was explained by the appearance of vacant sites in octet coordination.
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Hiraoka, K., Yokoyama, T. Hydration of poly(acrylic acid) sodium salts. Polymer Bulletin 2, 183–188 (1980). https://doi.org/10.1007/BF00254582
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DOI: https://doi.org/10.1007/BF00254582