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4 May 2012 Analysis of PEA photopolymers at zero spatial frequency limit
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The PEA photopolymer is composed of dipentaerythritol penta/hexa-acrylate as monomer and binder, N-vinyl pirrolidone as crosslinker, ethyl eosin as dye and N-methyl diethanolamine as radical generator. This photopolymer is suitable to work with dispersed liquid crystal molecules in dynamic holographic and diffractive applications. In order to characterize these materials we have analyzed the behaviour of different compositions at zero spatial frequency limit. This method is based on an interferometer that has been successfully applied in the phase-shift versus applied voltage characterization of liquid-crystal displays, in addition to that it has been applied to characterize PVA/AA and PVA/NaAO photopolymers. In PEA case there is no shrinkage since the photopolymer is coverplated. Samples have a glass substrate as the cover plate. In our analysis we have studied the importance of the monomer, crosslinker and crystal liquid molecules concentrations, in the phase shift produced in the layer during photopolymerization process.
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Sergi Gallego, Andrés Márquez, Marina Riquelme, Cristian Neipp, Manuel Ortuño, Augusto Beléndez, and Inmaculada Pascual "Analysis of PEA photopolymers at zero spatial frequency limit", Proc. SPIE 8429, Optical Modelling and Design II, 842925 (4 May 2012);


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