Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 25, Pages 8855-8858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja502366r
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Funding
- Outstanding Youth Fund of National Natural Science Foundation of China [50825301]
- Major International Joint Research Project of National Natural Science Foundation of China [51210004]
- China Scholarship Council [201206160040]
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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.
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