SYNTHONS AS BUILDING-BLOCKS IN THE SYNTHESIS OF LIQUID-CRYSTALLINE MULTIBLOCK COPOLYMERS

Synthetic approaches which allow to insert rather long fragments with exactly definite sequence of several single structural units into poly mer chains are considered and summarized. The procedure consists in pr eliminary formation of such sequences in a form of bifunctional ''comp lex monomer'' (synthons) which may undergo a polycondensation with oth er single or complex monomer to form macromolecule with definite alter nation of several single monomers. These synthetic approaches were use d for the synthesis of LC multi-block copolymers with definite structu re of rigid block.