Abstract
The present work investigates the possibility to control the alcoholysis reaction in order to obtain various sorts of polyvinyl alcohol with a predetermined degree of alcoholysis and high block copolymer character. On this purpose, two methods are suggested: quantitative determination of methyl acetate (resulted as a by product of the alcoholysis reaction) existing at a certain time in the system, and termination of the alcoholysis reaction according to a predetermined calibration curve. Keywords: Polyvinyl alcohol, polyvinyl acetate