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Nederberg, Fredrik; Trang, Vivian; Pratt, Russell C; Mason, Andrew F; Frank, Curtis W; Waymouth, Robert M; Hedrick, James L
Biomacromolecules, 01/2007, Letnik: 8, Številka: 11Journal Article
Herein, we describe an organocatalytic living polymerization approach to network and subsequent hydrogel formation. Cyclic carbonate-functionalized macromolecules were ring-opened using an alcoholic initiator in the presence of an organic catalyst, amidine 1,8-diazabicyclo5.4.0undec-7-ene. A model reaction for the cross-linking identified monomer concentration-dependent reaction regimes, and enhanced kinetic control was demonstrated by introducing a comonomer, trimethylene carbonate. The addition of the comonomer facilitated near-quantitative conversion of monomer to polymer (>96%). Resulting poly(ethylene glycol) networks swell significantly in water, and an open co-continuous (water-gel) porous structure was observed by scanning electron microscopy. The organocatalytic ring-opening polymerization of cyclic carbonate functional macromonomers using alcoholic initiators provides a simple, efficient, and versatile approach to hydrogel networks.
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