Time-lapse thiol-acrylate polymerization using a pH clock reaction

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A time-lapse polymerization exhibits a programmable time between the mixing of the reagents and the onset of polymerization. A clock reaction demonstrates an abrupt appearance of products after a period of time after mixing of the reactants. SEM images were obtained with a Jeol Scanning Electron Microscope. FTIR spectra were measured on a Bruker Tensor 27 FTIR spectrometer. When thiolacrylate drops were dispersed in the aqueous solutions of formaldehyde and bisulfltesulflte, a twophase system formed. 27 FTIR spectrometer. Particles sizes were measured with a Nikon Eclipse SOi microscope and Nikon Digital Sight DSFll connected to a computer. The increase in pH catalyzes the addition of thiols to acrylates at the interface of the drops. Although a formaldehydebased system would not have practical uses, the system serves as a proof of concept for an approach that could be useful for time-lapse curing of adhesives and coatings.

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Journal of Polymer Science, Part A: Polymer Chemistry

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