DETERMINATION OF THE COMPATIBILITY OF SBS-330L, SBS L30-01A AND DST R30-00 POLYMERS WITH PLASTICIZERS IN VARIOUS RATIOS

The paper presents the results of a comprehensive study of the compatibility of thermoplastic elastomers (SBS-330L, SBS L30-01A, and DST R30-00) with plasticizers (ENMA, PN-6K, and MPB-3) in ratios ranging from 90:10 to 70:30 for the modification of road bitumen. It was found that the SBS-330L polymer demonstrates the best compatibility, forming homogeneous mixtures with all plasticizers except MPB-3 at a ratio of 70:30, where a lack of plasticizing action is observed. For SBS L30-01A and DST R30-00, optimal results were obtained with PN-6K and ENMA at ratios of 90:10 and 80:20, while at 70:30, incomplete dissolution of the polymer was observed. MPB-3 showed low efficiency with all the polymers studied due to the peculiarities of its chemical composition, which includes organic acid salts. Analysis of the results revealed key factors affecting compatibility: the content of aromatic components in the plasticizer, its dissolving ability, and viscosity characteristics at different component ratios. Particular attention was paid to explaining the mechanisms of incompatibility associated with the lack of active aromatic fractions and the presence of polar compounds in plasticizers. Based on experimental data, practical recommendations were developed for the composition of modifying additives. The most promising compositions are those based on SBS-330L with PN-6K or ENMA in ratios of 80:20-90:10, which ensure the stability of the systems and improved performance characteristics of polymer-bitumen binders. The research results are important for the development of effective bitumen modifiers that contribute to improving the quality and durability of road surfaces. The data obtained open up new opportunities for optimizing the composition of building materials in accordance with modern standards.