This article is devoted to the synthesis of copolymers based on maleic anhydride and linear α-olefins. For the synthesis of copolymers used long-chain α-olefins - dodecene-1, tetradecene-1 and octadecene-1. The copolymerization was carried out by the method of initiated radical polymerization in an aromatic solvent medium. The copolymers are characterized by infrared Fourier spectroscopy. The viscosity characteristics of the copolymers were determined by capillary viscometry. The depressor activity of the copolymers was evaluated by examining the comparative rheological and low temperature properties of oil (ASTM D 97, ASTM D 5853) by heat treatment of oil at 60°C and various dosage of the copolymers. The synthesized copolymers showed depressive activity, improving the fluidity of oil at low temperatures. It was shown that the effectiveness of polymer depressant additives is determined by the chain length of the pendant groups of α-olefins.
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