Abstract
The effects of the pretreat-swelling of the NaOH-H2O-PVA powder and the addition of surface active agents (Brij 30-35, Sanisol C and Setamol WS) on the average valae and the distribution of the degree of cyanoethylation in the vapour phase preparation of the water soluble polyvinyl cyanoethyl ether were studied. Although the pretreat-swelling and the addition of active agents give almost no effects on the average degree of reaction, the former increases strikingly the precipitation temperature of the water solution of polyvinyl cyanoethyl ether (_??_20 mol %) in the swelling time of 0.5-2hrs, showing the repression of a distribution of the higher degree of reaction, and the latter shows a small increase of the precipitation temperature.
Furthermore, the fractionation experiments of the degree of reaction seem to show that the addition of active agents produces effects on the simplification of the frequency distribution of the degree of reaction, especially in the case of 1% Brij/PVA wt.
