The results of studies on the synthesis of triblock condensation polymers were presented. Block polyesteretheramide terpolymers (TPEEA) consisting of a flexible oligooxytetramethylene (PO) block with glass transition point below 0°C and the following hard blocks: oligotetramethyleneterephthalate (PE) and oligo-e-caprolactam block, both with glass transition points above room temperature, were prepared. These terpolymers were synthetized with the use of PE blocks of molecular weight 1500, 2000, 3000 and 4000 and with the content of these blocks in the range of 10 to 30 mass-%. The kontent of PO block was also changed in the range of 0 to 60 mass-%. The dependences of the course and results of polycondensation of these triblock polyesteretheramides on the molecular weight and content of PA and PO blocks were obtained.
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