The effect of air oxygen and several catalysts on the process of aminolytic destruction of polyethylene terephthalate by a mixture of amino alcohols (monoethanolamine and triethanolamine) at atmospheric pressure and convective heating is investigated. The terephthalic acid diamide obtained as a result of PET degradation is used as a monomer in the homofunctional polycondensation reaction. A new oligoesteramide containing an aromatic ring, two amide and hydroxyl groups in its structure was obtained. Its molecular weight was determined by a viscometric method. The use of the obtained oligoesteramide as a plasticizer in polar elastomeric compositions based on a mixture of butadiene-nitrile rubbers BNKS-40 and BNKS-28 is proposed. The effect on the kinetics of sulfur vulcanization and the viscosity of raw rubber mixtures is demonstrated. The acceleration of the vulcanization process has been revealed, as well as a decrease in the viscosity of rubber compounds, which contributes to a reduction in energy costs for processing and molding products. The change of elastic-strength parameters of vul-canized rubbers is substantiated. Comparison of rubber mixtures with oligoesteramide and plasticizers dibutyl phthalate, dioctyl phatalate and dibutylsebacinate was carried out. With the introduction of terephthalic acid oli-goesteramide, the elongation at break increases by 50-70 percent. The use of the obtained oligoesteramide as a plasticizer has an advantage relative to the selected comparison plasticizers, namely, the absence of "sweating" on the surface of the products during storage due to the higher molecular weight of oligoesteramide.