Reference : Dynamics of the photo-induced orientation and relaxation of new polymethacrylates contai...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/14883
Dynamics of the photo-induced orientation and relaxation of new polymethacrylates containing carbazolyl and azobenzene pendant groups
English
Maertens, Christophe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Dubois, Philippe [University of Mons-Hainaut (UMH) > > Laboratory of Polymeric and Composite Materials (SMPC) > >]
Jérôme, Robert mailto [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Blanche, Pierre-Alexandre [University of Liège (ULg) > > Centre Spatial de Liège (CSL) > >]
Lemaire, Philippe [University of Liège (ULg) > > Centre Spatial de Liège (CSL) > >]
Mar-1999
Polymer International
John Wiley & Sons
48
3
205-211
Yes (verified by ORBi)
International
0959-8103
[en] optical properties ; birefringence
[en] Polarized-light-induced birefringence has been investigated in copolymers of [-(N-carbazolyl)alkyl methacrylate] and [2,5-dimethylphenyl-[(4-nitrophenyl)azo]phenoxyalkyl methacrylate]. Optical properties of the side-chain copolymers have been compared with materials in which the azo-dye was merely dispersed in a poly[-(N-carbazolyl)alkyl methacrylate] matrix. Increasing the temperature of the film has a dramatic depressive effect on the maximum of photo-induced orientation near and above the glass transition temperature (Tg) region, while its effect was restricted under this temperature. Kinetics of the photo-orientation and the thermal relaxation as a function of temperature have been analysed by a biexponential model based on two rate constants. The universal Williams-Landel-Ferry (WLF) theory has been used to correlate the writing process and relaxation relative time constants with the relative temperature, i.e. T-Tg . The validity of this model for the studied materials leads to the assumption that photo-orientation and relaxation processes are mainly dependent on the free volume in the polymer matrix. This hypothesis has been assessed in the case of [11-(N-carbazolyl)undecyl methacrylate]-based materials.
Center for Education and Research on Macromolecules (CERM)
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Researchers
http://hdl.handle.net/2268/14883
10.1002/(SICI)1097-0126(199903)48:3<205::AID-PI92>3.0.CO;2-L
http://www3.interscience.wiley.com/cgi-bin/fulltext/60500191/PDFSTART

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