A series of the terpolymers of poly[(tetramethylene terephthalate)-block-(oxytetramethylene)-blocklaurolactam] with a variable molecular weight of ester block and the constant molar ratio of ether block to the amide block equal to 3:1 were obtained. The influence of variations in the molecular weight of ester block on the functional properties and on the values of phase change temperatures of the products was determined. The thermal properties and the phase separation of obtained systems were defined by DSC, DMTA and WAXS methods. The mechanical and elastic properties of obtained polymers were evaluated.

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