Short-block polyurea-polydimethylsiloxane block copolymers based on secondary diamines
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New short-block polyurea-polydimethylsiloxane block copolymers based on aliphatic and alicyclic secondary diamines and diisocyanates as well as on oligodimethylsiloxanes with glycidyl end groups were synthesized through a two-stage method. With the use of DSC and small-angle X-ray scattering methods, it was shown that, in the resulting block copolymers, in spite of the short block lengths, microphase separation occurs. The sizes of the formed domains, which correspond to the interplanar distances, decrease monotonically with a decrease in the sizes of the rigid and elastic blocks and become as low as 6.0–11.1 nm. The stress-strain characteristics of block copolymers are dependent above all on the ratio of blocks.
KeywordsPDMS Block Copolymer Polymer Science Series Polyurea Rigid Block
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