Abstract
A study was made of the variation of the degree of self-association of urethane groups and mechanical properties of polyurethanes, according to the length of flexible and rigid segments, the type and density of chemical crosslinking networks. In polyurethanes obtained from trifunctional polyethers with M⩾5000 chemical crosslinking does not change the degree of self-association, compared with linear polyurethanes. When introducing low-molecular weight crosslinking agents crosslinking reduces the degree of self-association to a greater extent than a network of the same density formed with polyester. Results confirm the structural micro-heterogeneity of polyurethanes with high density of crosslinking.
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