Abstract
Abstract It has been shown that PVA is partially esterified with n-butylboronic acid, giving products of the form of PVA (Remark: Graphics omitted.)B-n-Bu. The esterification grade, Eg, of the products is estimated from the boron content. Eg increases with the increasing concentration of n-butylboronic acid used, the maximum Eg being 85.6%. Eg rises from 69.3 to 85.6% as the reaction temperature is elevated from 40 to 70°C. On treating with n-butylboronic acid PVA shows new absorption bands 1190 and 1390 cm−1 in deeper infrared spectra, which are assigned respectively to –B–C and –B–O bonds. At the same time the OH stretching absorption band at 3280 cm−1 of PVA shifts to a higher frequency, and decreases in intensity with the increasing Eg.
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