Research of the polymer modifier functions in the realization of improved operational properties of acrylic adhesive compositions.

The paper presents information on the effect of polymer modifiers on the variation in production conditions and the main operational properties of filled acrylic systems, cured by the mechanism of radical polymerization. By preliminary injection and dissolution in the monomeric phase of modifiers - suspension polystyrene and its copolymers (with methyl methacrylate, methyl methacrylate and acrylonitrile) acrylic compounds were obtained with acceptable indicators of technological viscosity and the ability to adjust its viability under normal conditions. The combination of manufacturability and realizable physical characteristics of modified acrylic polymers made it possible to carry out on their basis the directed development of filled adhesive compositions with improved adhesion characteristics. According to the experimental data of relaxation spectroscopy and the calculated values of linear dilatometry, it was evaluated that when a filler is injected into the acrylic system, a supramolecular structure with a characteristic surface layer is formed, which makes a significant contribution to the variation in the macrophysical characteristics of the material (an increase in the dynamic shear modulus from 1.6 to 2.4 GPa). Therefore, mobilization to preserve the resource of the adhesive contact (not less than 18 MPa) with permissible amounts of filler (from 10 to 30 mass parts in polyacrylate) and thicknesses of the adhesive layer occurs due to the total contribution of the dispersed phase to the strengthening of the polymer. The superposition of various factors, and first of all, a decrease in the density of the polymer phase in the filled system, contributes to a slight drop in the adhesion strength of acrylic glue to a metal substrate, which in general should provide an acceptable degree of reliability of adhesive building constructions. [ABSTRACT FROM AUTHOR]