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Visible yellow and green light are central to a process that researchers from North Carolina State University used to produce polymer gel objects from pure monomer solutions. After dissolving zinc meso-tetraphenylporphyrin (ZnTPP) into pure monomers trimethylolpropane triacrylate (TMPTA) and methyl acrylate (MA) and exposing the solutions to yellow light, light-generated energy created homomolecular triplets in ZnTPP. When the triplets combine, they create an extremely short-lived S2 excited state with enough energy to power the polymerization process.
That initial process is called homomolecular triplet-triplet annihilation. The work has application in the production of polymer gel objects and polymer products, such as plastics. It…READ MORE