Abstract
Vinyl trifluoroacetate was polymerized in bulk at 60°C in the presence of 0.2% BPO. The polymer was then hydrolysed to polyvinyl alcohol (PVA) by various methods. Almost all samples of the PVA were soluble in water at 95°C and some of them at 105-115°C. The solution thus obtained (PVA 1-5%) was unstable at room temperature showing, according to samples, a reversible gelation or a precipitation of some insoluble portion by slight shaking. The number of 1, 2 glycol bonds per 100 vinyl bonds of the PVA was determined from its reaction with periodic acid by titration and found to be 1.05.
