Monohydroxy-hydrazone-functionalized Thermally Crosslinked Polymers for Nonlinear Optics
The synthesis and properties of six hydrazone-functionalized crosslinked polymers possessing stable nonlinear optics (NLO) properties are presented. First, a series of six hydroxy-functionalized, NLO-active hydrazone chromophores were synthesized. These chromophores were then grafted via its hydroxy functionality on an epoxy polymer to obtain the six NLO-active soluble prepolymers. The grafting reaction yielded multiple secondary hydroxyl sites, which were used for further crosslinking by formulation of the prepolymer with a blocked polyisocyanate crosslinker. This formulation was spin-coated on glass slides to form 2-2.5 thick defect-free transparent films. The films were corona-poled above their glass-transition temperatures to align the chromophores in a noncentrosymmetric fashion and were simultaneously cured. The thermal characteristics of the second-order nonlinearity of the six polymers were compared to illustrate the key structure-property relationships underlying the performance of the films in terms of NLO activity and thermal stability. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 770-781, 2004
R. K. Singh et al., "Monohydroxy-hydrazone-functionalized Thermally Crosslinked Polymers for Nonlinear Optics," Journal of Applied Polymer Science, John Wiley & Sons, Feb 2004.
The definitive version is available at http://dx.doi.org/10.1002/app.13309
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