ВПЛИВ ТЕХНОЛОГІЧНИХ ПАРАМЕТРІВ НА ФОРМУВАННЯ СТАБІЛЬНИХ ПЛА-ДИСПЕРСІЙ

Increasing environmental pollution by traditional oil-based plastics has become an important reason for the active development of biodegradable materials made from renewable raw materials, in particular polylactic acid (PLA). Among its numerous applications, aqueous dispersions are of great interest, as they can be used to create functional coatings or films. However, the stability of such dispersions and the morphology of the particles largely depend on the technological parameters of the process of their preparation. This paper presents the results of a study of the influence of technological parameters on the preparation of PLA dispersions. A methodology was developed for obtaining a stable dispersion by dispersing a solution of PLA in dichloromethane in the presence of SDS wetting agent under low-speed stirring, gradual heating, and subsequent stabilization of the system with a thickener. It was found that dichloromethane ensures uniform evaporation and avoids premature coagulation of the particles, unlike ethyl acetate, which demonstrated insufficient efficiency in this process. It was also found that sonication under the applied conditions does not reduce the particle size. The results obtained allowed us to determine the optimal conditions for the formation of PLA dispersions with micron-sized particles.