STUDY OF RADICAL COPOLYMERIZATION REACTION OF UNSATURATED POLYESTERS WITH ACRYLIC ACID

Abstract

One of the promising and inexpensive types of raw materials, taking into account the use of modern technologies for the production of sealing and adhesive materials, are unsaturated polyesters of various compositions.The aimof this work is to study the reaction of radical copolymerization of polyethylene(propylene)-glycolfumarate with acrylic acid in a dioxane solution at various molar ratios of the initial polymer-monomer mixture. Methodology.The composition of the copolymers was identifiedby HPLC spectroscopy by analyzing the mother liquors, the structure was confirmed by IR spectroscopy. The copolymerization kinetics was studied by the dilatometric method. The degree of swelling of the copolymers was determined by the gravimetric method, and their degree of unsaturation, by the bromid-bromate method. Radical copolymerization constants calculated by the Mayo-Lewis integral method.The results obtainedindicate thatfor any composition of the initial polymer-monomer mixture, the composition of the copolymer is enriched with acrylic acid links, and with an increase in its content in the initial polymer-monomer mixture, the reaction rate increases significantly.An increase in the content of unsaturated polyester in the initial polymer-monomer mixture leads to a decrease in the ability of the copolymer to absorb moisture, which makes it possible to assume their use as bases in the production of sealing and adhesive materials. Conclusion. An analysis of the numerical values of the copolymerization constants showed a higher activity of acrylic acid in comparison with unsaturated polyesters, thereby confirming the previously put forward assumption aboutthe relatively lower reactive ability of the latter.