Numerical modeling of ultrasonic cavitation influence on macromolecules fraction composition in liquid

Abstract

To date, the problem of controlling the properties of polymers is mainly solved by introducing additional chemical additives (hardeners, plasticizers, dispersed fillers, UV stabilizers, etc.). However, additional chemical additives, first of all, are consumables, which negatively affects the cost of the final product, are aggressive substances that result target material harmful to humans and the environment, as well as lead to corrosion of metal parts and components of the technical system. A promising area of research that can potentially serve as a basis for creating an effective technology for controlling the properties of polymers is the effect of ultrasonic cavitation influence on a high molecular weight medium. For predicting properties of polymer at different ultrasonic influence modes, for evaluating optimum ultrasonic influence modes with maximum energy efficiency, for predicting of ultrasonic cavitation influence on newly synthesized uncured polymers, the numerical model of ultrasonic influence on molecular composition is necessary. In the paper, the physical mechanism of breakup of high-molecular compounds under the ultrasonic cavitation influence was proposed. The numerical model was proposed for the elementary act of breakup of macromolecule. The numerical model for elementary act is scaled to an ensemble of many molecules. As a result of this scaling, the kinetic equation for the fractional composition of macromolecules with different amounts of monomer units has been formulated. In final, the fractional compositions of macromolecules under ultrasonic cavitation influence at different times were calculated.