| 초록 |
Block copolymers that combine a side-group liquid crystal polymer (SGLCP) block and a pH-responsive hydrophilic block, poly(acrylic acid) (PAA), are shown to confer pH-dependent anchoring of the director orientation at the aqueous/LC interface. At low pH the PAA block collapses and the inherent, planar alignment tendency of 5CB at a water interface prevails. As pH increases, the polyelectrolyte block becomes increasingly charged and expands, producing a change to homeotropic anchoring. SGLCP blocks can translate conformational changes of a responsive hydrophilic block into rapid, reversible changes in the director field. |
