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Modified Poly(Vinyl Alcohol) as a Dispersant in Suspension Polymerization of Vinyl Chloride. 4. Mixtures of Modified Poly(Vinyl Alcohol)

V. Macho, M. Fabíni, M. Rusina, S. Bobuľa, and M. Haruštiak

Department of Organic Technology, Faculty of Chemical Technology, Slovak Technical University, SK-812 37 Bratislava

 

Abstract: The mixtures of poly(vinyl alcohol) (PVA) with thermo-oxidatively modified poly(vinyl alcohol) (B) or acetalized poly(vinyl alcohol) (D) were used as the dispersants in suspension vinyl chloride homopolymerizations in compositions at wr(total, VC) = 0.1 mass %. Unmodified commercial PVA Alcotex 72.5 (A) produces porous poly(vinyl chloride) (PVC) grains with fast plasticizer absorption and low bulk density. Modified PVA B or D produce less porous PVC with substantially higher bulk densities. Defined mixtures of A with B or D can be used for the manufacturing of tailor-made PVC grades with required grain morphology, characterized by the grain size, porosity, and the bulk density.

Full paper in Portable Document Format: 492a102.pdf

 

Chemical Papers 49 (2) 102–105 (1995)

Thursday, October 29, 2020

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