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    Optical storage in azobenzene-containing epoxy polymers processed as Langmuir Blodgett films

    Year: 2013

    Journal: MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS, Vol. 33, p 1403-1408, 20150703

    Authors: Fernandez, Raquel; Mondragon, Inaki; Sanfelice, Rafaela C.; Pavinatto, Felippe J.; Oliveira, Osvaldo N., Jr.; Oyanguren, Patricia; Galante, Maria J.

    Organizations: Univ Basque Country, Euskal Herriko Unibertsitatea, Polytech Sch, Dept Chem & Environm Engn,Mat Technol Grp, Donostia San Sebastian 20018, Spain; Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil; Univ Mar del Plata, Inst Mat Sci & Technol INTEMA, RA-7600 Mar Del Plata, Buenos Aires, Argentina; Consejo Nacl Invest Cient & Tecn, Natl Res Council, RA-7600 Mar Del Plata, Buenos Aires, Argentina

    In this study, azocopolymers containing different main-chain segments have been synthesized with diglycidyl ether of bisphenol A (DGEBA, DER 332, n=0.03) and the azochromophore Disperse Orange 3 (DO3) cured with two monoamines, viz. benzylamine (BA) and m-toluidine (MT). The photoinduced birefringence was investigated in films produced with these azopolymers using the spin coating (SC) and Langmuir Blodgett (LB) techniques. In the LB films, birefringence increased with the content of azochromophore and the film thickness, as expected. The nanostructured nature of the LB films led to an enhanced birefringence and faster dynamics in the writing process, compared to the SC films. In summary, the combination of azocopolymers and the LB method may allow materials with tuned properties for various optical applications, including in biological systems were photoisomerization may be used to trigger actions such as drug delivery. (C) 2012 Elsevier B.V. All rights reserved.