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Novel liquid crystal block copolymers and their applications as sensors

2009년 8월 19일 16시 19분 06초
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고분자화학 - Novel Functional Nanostructures: ㅡ Materials, Structures, Properties and Applications Ⅱ
저자 및
경북대학교 고분자공학과, Korea
The amphiphilic liquid crystalline block copolymers of LCnP-b-PAA (n = 3, 6, 11, LCnP = poly(n-(4-cyanobiphenyl-4’-oxy)(CH2)n acrylate), PAA= poly(acrylic acid)) were synthesized by using a RAFT polymerization method. A TEM grid on the octadecyltrichlorosilane (OTS) coated glass was used for a sensor frame. The monolayer films of the block copolymers on the 4’-pentyl-4-cyanobiphenyl (5CB) were made by spreading the block copolymer solution on the water to make monolayer film, adsorption of the monolayer of the block copolymer on the 5CB filled TEM grid, sealing the sensor frame with epoxy, and filling water to control pH. 5CB on the OTS coated glass and at the interface with water was oriented perpendicular to the glass and parallel to the interface, respectively, making 5CB bright when the TEM grid was observed through polarized optical microscopy. LCnP-b-PAA at the interface with 5CB made 5CB to be aligned perpendicular to the interface at higher than pH = 10 but 5CB became parallel to the intersurface at lower than pH = 10. The shrinkage of PAA block at low pH changed the homeotropic to planar orientation by cooperative motion of 5CB at the interface. These cooperative motions were strongly dependent on the spacer length of the liquid crystal block copolymer. These results indicate that these LC TEM cells may be used as sensors which can detect environmental stimuli.