An investigation was made of the structure and properties of segmented polyether urethane ureas with heterogeneous rigid blocks, obtained using 2,4-toluylene diisocyanate and isophorone diisocyanate. Extremal dependences of the physicomechanical and thermal characteristics of the materials on the composition of the rigid blocks were found. The relationship between the structure and properties of the new type of block copolymer was established.
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