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14 May 2010 Using short exposures to approximate diffusion rates
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Establishing the rate of monomer diffusion in a polyvinylalcohol and acrylamide based photopolymer holographic material is of importance in terms of modelling the processes taking place during and postrecording and in working towards improving the materials response. Many methods have been used to estimate this value, resulting in a very wide range of suggested rates from 10-7-10-14 cm2/s. We examine the diffusion of polymer chains formed using short low intensity exposures, recorded in a modified material composition and then use these results to provide an estimate of monomer diffusion under low viscosity conditions i.e. minimal uncrosslinked polymerisation. Our modification of the material involves removing the crosslinking agent, the purpose of which is to increase polymer chain size and complexity and so make the recorded grating more stable. Removing it, the chains should be shorter and more linear - i.e. closer to the size of the monomer and so the rate of diffusion of the polymerised chains should approach the rate of diffusion of the monomer as the exposure and duration energy are smaller.
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C. E. Close, M. R. Gleeson, and J. T. Sheridan "Using short exposures to approximate diffusion rates", Proc. SPIE 7717, Optical Modelling and Design, 77171O (14 May 2010);

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