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a) Chemical structures of cyclooctyne-terminated PEG macromer and azide crosslinker containing the allyl sulfide functionality. b) Upon mixing the two species, a hydrogel network is rapidly formed incorporating the allyl sulfide reactive groups. Gelation is monitored by shear rheology in situ, and the storage modulus (solid line) and loss modulus (dotted line) are tracked. The final elastic modulus is reached within 10 min.
