Abstract
AbstractA study has been made on the modification of poly (vinyl alcohol) with diketene using tertiary amines as catalysts. The structure of the resulting polymers was determined by means of IR, 1H‐ and 13C‐NMR spectroscopy as well as by chemical analysis. Vinyl alcohol‐vinyl acetoacetate (VAL‐VAA) copolymers were obtained. It has been found a linear dependence of reaction rate on polymer, diketene and pyridine concentrations, respectively. The activation energy was found to be 35.5 kJ/mol (8.5 kcal/mol). 13C‐NMR spectroscopy was used for the determination of the sequence distribution in VAL‐VAA copolymers. The obtained results show that VAA units have a little alternating tendency in the copolymer chain. Polymeric chelates between VAL‐VAA copolymers and cupric ions have been prepared. It is noteworthy that not all the β‐keto ester groups in the VAL‐VAA copolymers participate in binding cupric ions.
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