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Schematized microgel preparation. A) 8-arm 20kDa PEG macromers are functionalized with norbornene with various intervening heteroatom linkers, affording photocrosslinkable hydrogels with a range of degradability. B) Granular hydrogels are prepared by submerged electrospray and subsequent thiol-ene photopolymerization. Microgels are synthesized off-stoichiometry with excess norbornene for post-printing scaffold annealing.
