MULTIPLE LENGTH SCALE SELF-ORGANIZATION IN LIQUID-CRYSTALLINE BLOCK-COPOLYMERS

A series of block copolymers were prepared consisting of a block of po ly(styrene) and a block in which a mesogenic group was attached by pol ymer analogous chemistry to a flexible backbone. Two types of mesogeni c groups which produced a range of mesophases were investigated: (i) a n azobenzene mesogenic group and (ii) semifluorinated group. Organizat ion caused by liquid crystallinity and phase separation leads to simul taneous organization on a variety of length scales. Comparison of the ordering behavior of these two types of mesogenic groups and more conv entional flexible chain diblocks are made.