Ionic Liquids in Photopolymerizable Holographic Materials

摘要: A variety of materials have been used to record hologram, such as silver halide emulsions, hardened dichromated gelatin, ferroelectric crystals, photochromics, photoresist, photodichroics and photopolymerizable [1-3]. Photopolymerizable holographic due their low cost dry processing attracted great interest in academics industry. They broad applications memories, recording media, LCD displays, helmet-mounted display, optical interconnects, waveguide couples, diffusers, laser eye protection devices, automotive lighting, security holograms. The composite contains mainly a matrix binder, monomer, an initiator system, plasticizer additives [417]. Due the inter diffusion unpolymerized monomers film, areas with high refractive index are formed during irradiation interference pattern. Many photopolymer systems developed including binary composites, organic-inorganic nanocomposites, hybrid host consisting porous glass, system using capable cationic ring-opening polymerization. addition or additive can increase modulation final diffraction efficiency. Monroe et al. reported that tri(2-ethylhexyl)phosphate, glyceryl tributyrate, polyethylene glycol functional etc. plasticizers may [18]. Frank recommended compositions triglycerides additives, which provide stable material [19]. Tucker trithiocarbonate efficiency, uniformity reproducibility formation electrically switchable gratings [20]. Finally, one publication reports about improve sensitivity hologram [21]. Ionic liquids organic salts liquid at ambient temperatures, preferably room temperature. nonvolatile, thermally chemically stable, highly polar liquids, ionic conductivity, large electrochemical window ease solubilization molecules transition metal complexes [22-25]. Applications include use synthesis, catalysis, separation, electrochemistry, electrolytes, lubrication, biomass processing, drug delivery others. cations