Abstract
It has been confirmed that foam fractionation of an aqueous poly (vinyl alcohol)(PVA) solution produced PVAs with different reactivity in the PVA–iodine reaction, namely the color intensity decreased with increase in the fraction number. This result was found not only with a PVA derived from poly(vinyl acetate) (PVAc), but also with a specimen derived from cationically polymerized poly(vinyl trimethylsilyl ether)(poly(VOSi)). Particularly in the case of PVA obtained from PVAc (DP, 1652, and syndiotacticity, 50.0% in dyad), the variation of color intensity among the fractions cannot be explained by any one of the structural factors such as molecular weight, the 1,2-glycol structure, stereoregularity, and the carbonyl group in the main chain. Therefore another molecular structure, for example short branching, which will affect the PVA–iodine reaction and the foam fractionation, should be considered. The result also indicates the homogeneity of PVA from PVAc with respect to stereoregularity and the 1,2-glycol structure contents. In the case of PVA obtained from poly(VOSi)(DP, 1496, and syndiotacticity, 37.5% in dyad), the fractionation with respect to stereoregularity has occurred; syndiotacticity of PVA contained in foam layers was higher than that in the residual solution. This result indicates that the PVA derived from poly(VOSi) consisted of stereoblock and/or a mixture of PVA of different tacticity.
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Kikukawa, K., Nozakura, Si. & Murahashi, S. Iodine Reaction of Poly(vinyl alcohol) Fractionated by Foaming. Polym J 3, 52–59 (1972). https://doi.org/10.1295/polymj.3.52
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DOI: https://doi.org/10.1295/polymj.3.52