###### Abstract  
Esters of aliphatic dicarboxylic acids are promising plasticizers of polyvinyl chloride due to their low toxicity and high biodegradability. Plasticized PVC materials containing them are characterized by high frost resistance and heat resistance. In this regard, esters of adipic acid and alkoxylated alcohols with various structures have been obtained. The influence of alcohol structure on the plasticizing ability of ether has been determined. A theoretical assessment of the plasticizing effect of diesters in relation to PVC was performed based on the calculation of Hansen solubility parameters. For this purpose, the thermodynamic compatibility of adjiates with PVC was investigated. The processability of esters in the composition of PVC compositions was studied according to the values of the critical temperature of dissolution of PVC. The intervals of transition of plastics from a glassy to a highly elastic state, as well as the depression of the glass transition temperature of compounds containing adjiates, were determined. Rheological characteristics of PVC compositions based on the obtained adjiates were investigated. It is shown that the chemical structure of the alcohol group determines the important technological and operational characteristics of esters in the composition of polymer materials.  
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more than EUR 6 billion in research and development to expand the range of these additives to ensure sustainable development, product safety and cost reduction [14; 15].  
As an alternative to phthalates, a wide range of compounds are being investigated, including biologically based plasticizers from renewable resources [16; 17; 18; 19].  
Bioplasticizers are substances with a low molar mass, produced on a biological basis or from plant products such as vegetable oils, sugar cane or plants containing starch. Epoxy esters based on vegetable oils have been studied as bioplasticizers, including soybean, linseed and tall oil, as well as citrates, stearic acid, lactic acid, glycerol esters, isosorbide, glycidylglycerin, rosin acid, tartaric acid esters and starch [20; 21; 22; 23].  
The use of biologically based plasticizers is currently very relevant. Bioplasticizers have great potential to replace and limit the use of traditional plasticizers and play an important role in the modern market. The demand for bio-based plasticizers of this kind is growing rapidly. The volume of the global bioplasticizer market in 2023 was estimated at USD 2.92 billion [24]. The average annual growth rate (CAGR) is 8.39%. Bioplasticizers have significant potential to replace phthalates in personal care products, food packaging, medical devices and toys. Typically, relatively expensive raw materials are required for the production of biologically based plasticizers.  
Alternative plasticizers are aliphatic esters of adipic, azelaic and sebacic acids. The use of these additives is currently widespread on an industrial scale, due to their low toxicity and excellent operational and technological characteristics, such as frost resistance and thermal stability. Research work on the search for and study of new esters of aliphatic dicarboxylic acids has shown the effectiveness of their use in PVC compounds to improve mechanical and thermal properties [25; 26; 27; 28]. Therefore, there is a need for further research to expand the range of these esters, since there is a greater demand for them in the plastic industry.