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. 2013 Feb 12;25(5):761–767. doi: 10.1021/cm303913f

Figure 5.

Figure 5

Schematic depicting photodegradation of the coated hydrogel core that possesses degradable groups in the polymer network. The core is fabricated by copolymerization of poly(ethylene glycol) diphotodegradable-acrylate (PEGdiPDA) and poly(ethylene glycol) tetrathiol (PEG4SH). The o-nitrobenzyl ether moieties (NBE) in the PEGdiPDA structure absorb strongly at 365 nm, and the resulting irreversible cleavage causes degradation of the cross-links and, ultimately, the formation a liquid core.