Photoresponsive azobenzene/nematic liquid crystal (LC) systems were developed which exhibit no phase separation upon E → Z photoisomerization, even at azobenzene loading as high as 20 wt %. It was shown that Z-3,3′-dialkanoyloxy azobenzene 1a and 1b correlated with the LC host as well as the corresponding E-isomers. The compatibility increased when methyl groups were embedded to the 2 and 2′ position of 3,3′-dialkanoyloxy azobenzene (1b), proving the effectiveness of a steric hindrance to the formation of stable rod-like conformations. After UV exposure, system with 1b exhibited a very sharp TNI at 35.7°C. In contrast, the Z-4,4′-disubstituted analog 2 disorganized the LC orientation because of the bent structure. Experimental results were in agreement with simulation results.
|Number of pages||2|
|Journal||American Chemical Society, Polymer Preprints, Division of Polymer Chemistry|
|Publication status||Published - 1998 Aug 1|
|Event||Proceedings of the 1997 Boston Meeting - Boston, MA, USA|
Duration: 1998 Aug 23 → 1998 Aug 27
ASJC Scopus subject areas
- Polymers and Plastics