Abstract
The photopolymerization of styrene in emulsion is achieved in a conventional double-wall reactor equipped with a LED ribbon coiled around the external glass wall. Styrene mixed to acridine orange is added to the water phase containing sodium dodecyl sulfate, a water-soluble N-heterocyclic carbene-borane and disulfide, and irradiated. Highly stable latexes are obtained, with particles up to a diameter of 300 nm. The ability to reach such large particle sizes via a photochemical process in a dispersed medium is due to the use of visible light: the photons in the visible range are less scattered by larger objects and thus penetrate and initiate better the polymerizations. They are also greener and cheaper to produce via LEDs, and much safer than UVs. The method presented does not require any specific glassware; it works at lower temperature and delivers larger particles compared to thermal processes at similar solids contents and surfactant concentrations.
Highlights
FrØdØric Le QuØmØner, Daniel Subervie, Fabrice Morlet-Savary, Jacques LalevØe,* Muriel Lansalot,* Elodie Bourgeat-Lami,* and Emmanuel Lacôte*
Inverse emulsion photopolymerization was studied,[10] its mechanism should be better described as microsuspension polymerization
Given the dearth of efficient systems to initiate emulsion photopolymerizations, we considered NHC–boranes as potential solutions to this challenge
Summary
FrØdØric Le QuØmØner, Daniel Subervie, Fabrice Morlet-Savary, Jacques LalevØe,* Muriel Lansalot,* Elodie Bourgeat-Lami,* and Emmanuel Lacôte*. Previous efforts have examined various systems to induce initiation in the water phase,[8] and in the micellar phase, and very specific methods (use of magnetic fields) have to be found to ensure efficiency.[9] Inverse emulsion photopolymerization was studied,[10] its mechanism should be better described as microsuspension polymerization.
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