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. Author manuscript; available in PMC: 2018 Oct 30.
Published in final edited form as: Chem Soc Rev. 2017 Oct 30;46(21):6532–6552. doi: 10.1039/c7cs00445a

Figure 4.

Figure 4

Thiol-ene photoclick chemistry is a mild and efficient reaction for hydrogel formation and functionalization. a) The thio-ene reaction mechanism, showing the cycle of propagation (thiyl radical addition to alkene) and chain transfer to generate a new thiyl radical. b) Under ambient conditions and identical photoinitiating schemes and functional group concentrations, hydrogels are formed by the thiol-ene reaction within 5 s; comparatively, hydrogels formed by homopolymerization of PEG-diacrylate are delayed. Reproduced from McCall et al.104 Copyright (2012) American Chemical Society.

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