Polymers, azobenzene containing

Corvazier, L Zhao, Y, Induction of Liquid Crystal Orientation through Azobenzene-Containing Polymer Networks, Macromolecules 32, 3195, 1999. 

Cojocariu C, Rochon P. (2004) Light-induced motions in azobenzene-containing polymers. Pure Appl Chem 76 1479-1497... 

We then started synthesizing many novel azobenzene-containing polymers in order to investigate what were the most important structural factors affecting this photoinduced orientation. In order to be able to compare various pol>Tners,... 

Ivanov, M, Naydenova, I., Todorov, T., Nikolova, L., Petrova, X, 7 omova, N., Dragostinova, V. (2000). Light-induced optical activity in optically ordered amorphous side-chain azobenzene containing polymer./. Mod. Opt. 47, 861-867. 

Natansohn, A., Rochon, P. (1997). Azobenzene-containing polymers Diptal and holc aphic storage. In ACS Symposium Series Photonic and Optoelectronic Polymers (K. J. Wynne and S. A. Jenekhe, Eds.), Vol. 672,236-249, American Chemical Society Washington, DC. Natansohn, A., Rochon, P. (1999). Photoinduced motions in azobenzene-bashd mnorphous polymers. Adv. Mater. 11,1387-1391. 

Lagugne Labarthet, E, Rochon, P., Natansohn, A. (1999). Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene-containing polymer. Appl. PIrys. Left. 75, 1377-1379. 

In another study, Constantino et al. observed by surface-enhanced resonant Raman scattering that the molecular architecture in an SRG inscribed on an LB film from an amorphous azobenzene-containing polymer was the same along and across the grooves, in contradiction to the findings of... 

Labarthet, R L., Buffeteau, T., and Sourisseau, C. Analyses of the diffraction efficiencies, birefringence, and surface relief gratings on azobenzene-containing polymer films. /. Phys. Chem. B 1998, 102, pp. 2654-2662. 

Seki, T., Sekizawa, H., Morino, S., and Ichimura, K. Inherent and coopoerativc photomechanical motions in monolayers of an azobenzene containing polymer at the air-water interface. /. Phys. Chem. B., 102, 5313 (1998). 

A comprehensive review of the photoisoraerization of azobenzene containing polymers draws attention to the many useful physical... 

New photoresponsive polymers and peptides have been developed by incorporation of an azobenzene chromophore. The photochemistry of azobenzene-containing polymers has been reviewed,and the ion-conducting polymer composite film of poly(vinyl chloride)/the azobenzene liquid crystal (4)/lithium perchlorate is a promising material for use in photoinduced image storage.Photoisomerization has also been demonstrated... 

For comparison, a statistical copolymer was synthesized by a common free radical polymerization of hydroxyethyl methacrylate (HEMA) and styrene with AIBN as initiator, followed by a polymeranalogous reaction to the azobenzene-containing polymer (Afn 33,000g mol, PDI 1.6). The copolymer, comprising 28wt% of azobenzene side-groups, exhibits a Tg at 88°C, but no liquid crystalline behavior was observed. 

Fig. 18 Inscribed surface structures in an azobenzene-containing polymer left SRG right egg-crate structure, which was produced by superimposing two SRGs with the sample being rotated 90° prior to the second inscription process. (Reprinted with permission from [20]. Copyright 1995 American Institute of Physics)...

It is known that a free surface is required for SRG formation. An azobenzene-containing polymer surface covered with a 25 nm-thick non-photoactive layer seems to be sufficient to fully suppress SRG formation [96], Here, we demonstrate that polymers with azobenzene moieties as side-groups and terminal perfluoroalkyl chains can efficiently suppress SRG formation in a similar manner. 

Fig. 26 Maximum refractive index modulation (n max) and azobenzene-content normalized maximum refractive index modulation (n max/c) of different types of cyano-azobenzene-containing polymers...

It is possible to inscribe many more multiplexed holograms at the same position with these azobenzene-containing polymer blend samples. The limit is determined by the... 

---