Monochromatic
Visible Light “Photoinitibitor”:
Janus-Faced Initiation and Inhibition for Storage of Colored 3D Images
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Abstract
Controlling the kinetics
and gelation of photopolymerization is
a significant challenge in the fabrication of complex three-dimensional
(3D) objects as is critical in numerous imaging, lithography, and
additive manufacturing techniques. We propose a novel, visible light
sensitive “photoinitibitor” which simultaneously generates
two distinct radicals, each with their own unique purpose–one
radical each for initiation and inhibition. The Janus-faced functions
of this photoinitibitor delay gelation and dramatically amplify the
gelation time difference between the constructive and destructive
interference regions of the exposed holographic pattern. This approach
enhances the photopolymerization induced phase separation of liquid
crystal/acrylate resins and the formation of fine holographic polymer
dispersed liquid crystal (HPDLC) gratings. Moreover, we construct
colored 3D holographic images that are visually recognizable to the
naked eye under white light