Abstract
In order to further develop the understanding of photopolymer materials, a more complete physical model has become necessary. In particular, a more accurate description of the photochemical mechanisms occurring during the photopolymerization processes is needed. Generally, in photopolymers, the photosensitizer absorbs light of an appropriate wavelength, becoming excited and causing the production of primary radicals, R•. In free radical polymerization systems, the generation of R• is a key factor in determining how much monomer is polymerized. This in turn is closely related to the refractive index modulation formed during holographic recording. In this article, we incorporate a detailed photoinitiation model into the nonlocal photopolymerization driven diffusion (NPDD) model. This model describes the following: (1) Photon absorption behavior and primary radical generation during initiation; (2) nonlocal macro-radical chain growth through propagation; (3) oxygen diffusion and replenishment for inhibition; (4) multiple termination mechanisms. This extended model is experimentally validated for high intensity holographic exposures to a polyvinylalcohol/acrylamide based photopolymer material.
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