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Component change of reducing polymerization shrinkage of holographic photopolymer

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Document pages: 11 pages

Abstract: Polymerization induced shrinkage is one of the main reasons why many photopolymer materials are not used in some applications, including holographic optical elements and holographic data storage. In this paper, the changes of two components of acrylamide based photopolymer with reduced shrinkage are reported. The dynamic changes of shrinkage process of modified photopolymer during real-time holographic recording were studied by holographic interferometry. Firstly, the effect of replacing acrylamide monomer in photopolymerization composition with diacetone acrylamide, a larger monomer molecule, on polymerization induced shrinkage was studied. Using this composition change, the relative shrinkage is reduced by 10 – 15 . thissecond method tested for shrinkage reduction involved the incorporation of BEA-type zeolite nanoparticles in the acrylamide-based photopolymer. A reduction in relative shrinkage of 13 was observed for acrylamide photopolymer layers doped with 2.5 wt. BEA zeolites in comparison to the undoped photopolymer.

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