Optical anisotropy and non-linear optical properties of azobenzene methacrylic polymers

Rodríguez, F. J.; Sánchez, Carlos; Villacampa, Belén; Alcalá, R.; Cases, R.; Millaruelo, M.; Oriol, Luis

doi:10.1016/j.polymer.2004.01.069

Cited by 37 publications

(11 citation statements)

References 36 publications

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“…In our group, different series of azobenzene containing homopolymers and copolymers, mostly based on the covalent binding of chromophores to the main polymeric chain, have been described for different applications which include block copolymers for volume holographic storage . Along with the covalent one, supramolecular approaches based on the molecular recognition between chromophores and complementary side groups distributed along a polymeric chain have been less often considered .…”

Section: Introductionmentioning

confidence: 99%

Photoresponsive polymers and block copolymers by molecular recognition based on multiple hydrogen bonds

Concellón

Blasco

Piñol

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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A new methacrylate containing a 2,6‐diacylaminopyridine (DAP) group was synthesized and polymerized via RAFT polymerization to prepare homopolymethacrylates (PDAP) and diblock copolymers combined with a poly(methyl methacrylate) block (PMMA‐b‐PDAP). These polymers can be easily complexed with azobenzene chromophores having thymine (tAZO) or carboxylic groups with a dendritic structure (dAZO), which can form either three or two hydrogen bonds with the DAP groups, respectively. The supramolecular polymers were characterized by spectroscopic techniques, optical microscopy, TGA, and DSC. The supramolecular polymers and block copolymers with dAZO exhibited mesomorphic properties meanwhile with tAZO are amorphous materials. The response of the supramolecular polymers to irradiation with linearly polarized light was also investigated founding that stable optical anisotropy can be photoinduced in all the materials although higher values of birefringence and dichroism were obtained in polymers containing the dendrimeric chromophore dAZO. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 3173–3184

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Section: Introductionmentioning

confidence: 99%

Photoresponsive polymers and block copolymers by molecular recognition based on multiple hydrogen bonds

Concellón

Blasco

Piñol

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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“…This is due to the fact that only the photoselection process of the diarylethene molecules could occur under the action of the polarized visible light. This process cannot lead to the cooperative orientation of mesogenic fragments, contrary to what is observed for photochromic azobenzene systems 14–29. Apparently, there is enough free volume and thermal energy for the thermal rotation of the diarylethene molecules, even in the glassy state of the cholesteric polymer matrix.…”

Section: Resultsmentioning

confidence: 69%

“…It is worth noting that a great number of publications which deal with photoorientation processes are devoted to azobenzene‐containing polymer systems 14–29. Of special interest are nematic liquid crystalline polymers with azobenzene side groups, because they offer a few advantages over ones based on amorphous polymers.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Photoorientation Phenomena in Cholesteric Polymer Systems Containing Photochromic Diarylethene Derivatives

Medvedeva

Bobrovsky

Boiko

et al. 2006

Macro Chemistry & Physics

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Photoorientation processes in two cholesteric mixtures were studied. Mixture I contained a nematogenic phenylbenzoate homopolymer, a photochromic diarylethene dopant and a chiral dopant. Mixture II consisted of a binary comb-shaped nematogenic copolymer with fluorescent perylene side groups and the same chiral and photochromic dopants. Irradiation of the mixtures with a polarized UV light did not induce photoorientation of the photoinduced ''closed'' form of the diarylethene dopant. However, the action of a polarized visible light on films of mixtures irradiated with UV light led to the appearance of dichroism.This phenomenon is associated with the photoselection process of the photochromic diarylethene molecules in the cholesteric matrix. An investigation of the kinetics of the photosensitized back photoreaction of the photochromic molecules in the cholesteric mixture showed that the polarized energy transfer from the fluorescent groups to the photochromic diarylethene dopant caused an increase in the photoselection rate. The thermal stability of dichroism in films of the mixtures was studied and it was shown that the disappearance of the dichroism of the diarylethene molecules occurred with a noticeable rate even at room temperature.Scheme of photophysical and photochemical processes under the indirect excitation of diarylethene molecules.

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“…The key to the interesting applications of azobenzenes is the facile and reversible isomerization of the azo bond, between the more thermally stable E configuration and the meta-stable Z form [11][12][13][14][15]. This photo-isomerization of azobenzenes with ultraviolet irradiation or laser has been used to influence conformational, optical or surface properties of polymeric materials that incorporate them [16,17]. An azo solution under illumination will achieve a photostationary state, with a steady-state E-Z composition based on the competing effects of photoisomerization and thermal relaxation back into the E state.…”

Section: Introductionmentioning

confidence: 99%

Advances in understanding the photoresponsive behavior of azobenzenes substituted with strong electron withdrawing groups

Jerca

Rău

et al. 2015

Optical Materials

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Optical anisotropy and non-linear optical properties of azobenzene methacrylic polymers

Cited by 37 publications

References 36 publications

Photoresponsive polymers and block copolymers by molecular recognition based on multiple hydrogen bonds

Photoresponsive polymers and block copolymers by molecular recognition based on multiple hydrogen bonds

A Study of the Photoorientation Phenomena in Cholesteric Polymer Systems Containing Photochromic Diarylethene Derivatives

Advances in understanding the photoresponsive behavior of azobenzenes substituted with strong electron withdrawing groups

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