Location of the Azobenzene
Moieties within
the Cross-Linked Liquid-Crystalline Polymers Can Dictate the Direction
of Photoinduced Bending
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Abstract
We present a simple way to control the photoinduced bending
direction
of azobenzene-containing cross-linked liquid-crystalline polymers.
By changing the location of the photoactive azobenzene moieties from
cross-links to side-chains, the bending direction of the sample is
reversed under identical irradiation conditions. In addition to providing
a versatile route toward directionality control of the photoinduced
macroscopic motions, this observation highlights the complicated nature
of the photomechanical response of azobenzene-containing cross-linked
liquid-crystalline polymers, showing that the photomobile behavior
can be determined by seemingly small details on the materials design