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Polymerization of vinyl chloride. Molecular weight distribution of polyvinyl chloride during the suspension process

โœ Scribed by Pezzin, G. ;Talamini, G. ;Vidotto, G.

Publisher
Wiley (John Wiley & Sons)
Year
1961
Weight
436 KB
Volume
43
Category
Article
ISSN
0025-116X

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โœฆ Synopsis

Abstract

The molecular weight distribution curves of six samples of polyvinyl chloride taken during a suspension polymerization were determined. The degrees of conversion of the samples varied from 4% up to 94%. Fractionations of the samples were carried out in the system tetrahydrofuranโ€water by fractional precipitation. It appears that the molecular weight distribution does not substantially vary in the course of the polymerization. The experimental results are discussed.

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## SYNOPSIS Aqueous solutions of partly hydrolyzed polyvinyl acetate (polyvinyl alcohol, PVA) and hydroxypropyl methylcellulose (HPMC) are used together as dispersants in vinyl chloride suspension polymerization. Surface tension, viscosity, and cloud point ( C P ) of diluted PVA and HPMC solutions