Structural peculiarities of block copolyurethanes with peptide links as rigid block extenders.

X-ray crystal analysis was performed on block copolyurethanes with peptide links as rigid block extenders. The increase in peptide link length was shown to improve the microphase separation of flexible and rigid segments. The influence of the isocyanate nature on phase separation conditions in the block copolyurethanes studied was established. The correlation between mechanical and temperature characteristics and peculiarities of the microphase structure was found. The latter seems especially important because of the dependence existing between the biodegradation tendency of the polyurethanes and their supermolecular organization.