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dc.contributor.authorGiménez, Raquel-
dc.contributor.authorPiñol, Milagros-
dc.contributor.authorSerrano, José Luis-
dc.contributor.authorViñuales, Ana I.-
dc.contributor.authorRosenhauer, Regina-
dc.contributor.authorStumpe, Joachim-
dc.identifier.citationPolymer 47(16): 5707-5714 (2006)en_US
dc.description8 pages, 7 figures, 3 tables.en_US
dc.description.abstractNew poly(methacrylate) copolymers containing 90 mol% of a promesogenic unit based on the 4-butoxybenzanilide, 4-cyanobiphenyl or 4-cyanoterphenyl cores and 10 mol% of a photosensitive push–pull substituted 4-(N-methylamino)-4′-nitrostilbene group have been prepared. All polymers are liquid crystalline and thermally stable with decomposition temperatures above 320 °C. The irradiation with linearly polarised light (either 325, 365 or 488 nm) results in the induction of a small optical anisotropy in the films due to an angular-selective photoreaction, whereas the absorbance perpendicular to the electric field vector of the incident light becomes larger compared to the absorbance parallel to it. In films of the copolymer containing 4-cyanobiphenyl and 4-(N-methylamino)-4′-nitrostilbene units, the anisotropy was significantly enhanced by annealing above Tg up to a dichroism D = 0.5. A thin film aligned by this procedure shows an anisotropic red emission with a ratio of 2.8 between emission intensities in the parallel and perpendicular directions due to the presence of oriented fluorescent stilbene units.en_US
dc.description.sponsorshipThis work was supported by the EC Brite/Euram project BE97-4210 Photoflu, the CICYT–FEDER Spanish projects MAT 2002-04118-C02-01 and MAT 2003-07806-C02-01, the Government of Aragon and the Programas Ramón y Cajal and FPI (MCyT–MEC, Spain).en_US
dc.format.extent24576 bytes-
dc.subjectLiquid crystalline polymeren_US
dc.subjectPolarised luminescenceen_US
dc.titlePhoto-induced anisotropic films based on liquid crystalline copolymers containing stilbene unitsen_US
dc.description.peerreviewedPeer revieweden_US
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