アセチレンアルコールとその誘導体に関する研究 (第11報)

ポリビニルピロリドンの分別と粘度測定結果について

抄録

Polyvinylpyrrolidone, used as the substitute plasma, is said to be effective when the molecular weight is around 30, 000 to 50, 000, and the inclusion of lower or higher molecules is thought to give adverse effect as a substitute plasma. The polymer obtained by the polymerization of vinylpyrrolidone with hydrogen peroxide and ammonia catalyst was extracted with acetone at a room temperature and fractionated by reprecipitaton from aqueous solution with acetone, obtaining a distribution curve for molecular weights.
On the other hand, distribution curve of molecular weights was also obtained by the same method from the polyvinylpyrrolidone marketed by the German Bayer and the two curves were found to be very similar. These results show that the extraction of low molecular polymers with a solvent like acetone is effective in obtaining polyvinylpyrrolidone of high homogeneity. Polyvinylpyrrolidone is known to take a coiled form in a solution that its viscositic characteristics in dilute aqueous solution were also examined and it was observed that the Huggins' viscosity constant, k', markedly changes with the degree of polymerization.