Abstract
AbstractPoly(vinyl alcohol)s derived from poly(vinyl trifluoroacetate), obtained by free radical polymerization of vinyl trifluoroacetate in various kinds of solvents at temperatures between 60 and −40°C, are reacted with iodine in aqueous solution, and UV‐spectra of the solutions were measured after the reaction. The absorption maximum in the UV‐spectrum appears at 600 nm for the polymers obtained in ketones, alkanes, and esters or at 590 nm in aldehydes. The absorbance of the maximum increases with increasing syndiotacticity up to a content of syndiotactic diads of Xs ≈︁ 55,5–58,5% or of triads of Xss ≈︁ 34,2–39,3%, then it passes through a maximum value and decreases with increasing Xs or Xss. It is considered that the increases is due to the stereoregularity of the PVA molecules and that the decrease is due to the formation of microgels in solution.
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