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12 September 2007 Polarization dependent photoactuation in azobenzene LC polymers
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We report on the photoactuation of high modulus liquid crystalline polymers with side chain azobenzene mesogens (azo-LCP). Photomechanical deformation is actuated with the 442 nm line of a He-Cd laser. Early results show that this system achieves displacement of up to 85° towards the actinic source when the He-Cd polarization is parallel to the nematic director and approximately 30-40° when the polarization is orthogonal to the nematic director. A wide range of materials have been synthesized by the photopolymerization of a liquid crystal diacrylate monomer (RM257) and an azobenzene-containing monoacrylate liquid crystalline monomer. Interestingly, azo-LCP formed with holographic photopolymerization have faster bending rates than polymers formed with flood-lit illumination of equivalent intensity.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Timothy J. White, J. J. Koval, V. P. Tondiglia, L. V. Natarajan, R. A. Vaia, S. Serak, V. Grozhik, N. Tabirian, and Timothy J. Bunning "Polarization dependent photoactuation in azobenzene LC polymers", Proc. SPIE 6654, Liquid Crystals XI, 665403 (12 September 2007);

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