Abstract
Density measurements were carried out at 25°C for aqueous poly(vinyl alcohol) (PVA) solutions of various borax concentrations. The partial specific volume v2° of PVA increased slightly with increasing borax concentration, from 0.754 ml g−1 in water to 0.777 ml g−1 in 5×10−2 moll−1 aqueous borax. From the density increments in the dialysed systems, the apparent volume φ′ was found to decrease from 0.725 ml g−1 at 4.6×10−3 moll−1 borax to 0.635 ml g−1 at 5.7×10−2 moll−1 borax. The preferential interaction parameter ξ3° (grams of borax bound per gram of PVA) was positive and became larger with increasing borax concentration. The net hydration ξ1° (grams of water bound per gram of PVA) was negative and became less negative with an increase in borax concentration. The relationships between ξ3° and ξ1° and physical binding and exclusion of low-molecular-weight components are discussed in terms of a simple model proposed by Reisler et al. It was found that at a limit of infinite concentration of borax, about 0.085 g of borax is bound and 7.0 g of water is excluded per gram of PVA.
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Ochiai, H., Fujino, Y., Tadokoro, Y. et al. The Partial Specific Volume and Preferential Interactions of Poly(vinyl alcohol) in Aqueous Borax Solutions. Polym J 13, 351–356 (1981). https://doi.org/10.1295/polymj.13.351
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DOI: https://doi.org/10.1295/polymj.13.351