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M.A. Knypl

Polyelectrolyle lerpolymers of acrylic acid, vinyl acetate and alkyl acrylates

Polimery 1993, No 2, 59

DOI: dx.doi.org/10.14314/polimery.1993.059


A semi-continuous emulsion polymerization of the title terpolymers of acrylic acid (AA), vinyl acetate (VAC) and Cj–C4-alkyl acrylates in the form of stable homogeneous dispersions was proposed. These dispersions form clear solutions of high viscosity under the action of alkalis. In the method, a mixture of comonomers is added dropwise to the aqueous phase. The minimum content of AA in terpolymer is 10 mass-% in the case of using methyl acrylate (MA) (MA:VAC mass ratio = 70–50:20–40), 15 mass-% in the case of using ethyl acrylate (EA) (EA:VAc mass ratio = 55–40:30–45), and 25 mass-% in the case of using butyl acrylate (BA) (BA:VAC mass ratio = 35–25:40–50). The preparation of a stable and homogeneous terpolymer is possible only to AA content in the comonomer mixture up to about 40 mass-%. Both the course of terpolymerization and some physicochemical properties of products depend considerably on the dosing rate of comonomer mixture. The effect of acrylate type on the polymerization kinetics and on changes in solubility and viscosity of the dispersions under the action of alkalis was also determined and explained. It was found that the behaviour of terpolymers containing BA differs considerably from those containing MA or EA.

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