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Quadratic nonlinear optical and preliminary piezoelectric investigation of crosslinked samples obtained from a liquid chromophore
Authors:Roberto Centore  Antonio Concilio  Fabio Borbone  Sandra Fusco  Antonio Carella  Antonio Roviello  Glauco Stracci  Antonio Gianvito
Institution:1. Department of Chemistry “Paolo Corradini,” University of Naples “Federico II,” Via Cinthia, I‐80126 Naples, Italy;2. Laboratory of Smart Structures and Vibroacoustics, The Italian Aerospace Research Centre, CIRA, Via Maiorise, I‐81043 Capua (CE), Italy;3. Department of Physics, Universitá di Roma Tor Vergata, Via della Ricerca Scientifica 1, I‐00133 Rome, Italy
Abstract:A push–pull chromophore has been synthesized, which is liquid at room temperature and can be crosslinked owing to the presence of two methacrylate moieties. Thin films of the chromophore have been prepared by spin coating, and they have been simultaneously crosslinked and poled under strong electric field. On the poled crosslinked films, the quadratic nonlinear optical (NLO) characterization was performed through nonresonant second harmonic generation measurements at 1368 nm as the fundamental wavelength, yielding a fairly good d33 value of 46 pm/V, with retention of 80% of that value after 2 months at 85 °C. Following the theoretical issue that the quadratic NLO and piezoelectric tensors of a material have the same symmetry properties, and exploiting the easy processing of the chromophore in the liquid phase, we have prepared poled crosslinked samples of the chromophore suitable for piezoelectric tests that were performed using a commercial piezoceramic sample as the reference. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012
Keywords:azo polymers  crosslinking  NLO  piezoelectric  polymers
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