03 Jul 01:58
by Jordan P. Hooker,
Florian Feist,
Laura Delafresnaye,
Leonie Barner,
Christopher Barner‐Kowollik
Highly narrow‐disperse multifunctional particles with a tunable size range are prepared via visible‐light induced crosslinking of prefunctionalized polymers using a new photochemical platform technology. Proceeding rapidly in just hours at ambient temperature in the absence of any kind of additives such as stabilizers, bases, or catalysts, the system provides powerful possibilities for highly advanced particle design.
Abstract
A new strategy for particle synthesis is enabled by utilizing modern synthetic, polymer, and photochemical techniques to facilitate the synthesis of highly narrow–disperse multifunctional microspheres from visible‐light induced crosslinking of prepolymers in both a single and dual polymer system. The approach requires no stabilizers, bases, or initiators, and proceeds at ambient temperature to yield microspheres with a tunable size range (0.25–5 µm) in less than 4 h, depending largely on solvent composition, but also polymer concentration (2–10 mg mL−1), ratio, and irradiation intensity (3–20 W). Critically, the visible‐light induced dimerization reaction exploited herein enables simple functional particle syntheses via a single polymer system. Underpinned by an in‐depth kinetic analysis of the particle formation as well as a detailed small molecule study, the mechanism for particle formation is also elucidated. Importantly, inherent advantages of the system are exploited for surface functionalization of residual acrylate and hydroxyl groups (generating inherently fluorescent particles).
15 Jun 02:20
by Ting Jiang, Nicholas F. Polizzi, Jeff Rawson and Michael J. Therien
Journal of the American Chemical Society
DOI: 10.1021/jacs.7b04400
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by Florian Auras, Laura Ascherl, Amir H. Hakimioun, Johannes T. Margraf, Fabian C. Hanusch, Stephan Reuter, Derya Bessinger, Markus Döblinger, Christina Hettstedt, Konstantin Karaghiosoff, Simon Herbert, Paul Knochel, Timothy Clark and Thomas Bein
Journal of the American Chemical Society
DOI: 10.1021/jacs.6b09787
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Macromolecules
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