期刊
MACROMOLECULES
卷 45, 期 18, 页码 7440-7445出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma3015189
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fonds quebecois de la recherche sur la nature et les technologies of Quebec (FQRNT)
- FRQS
CO2-responsive ABA triblock copolymer hydrogels are described. Through rational block copolymer design, these hydrogels could undergo either CO2-induced gel-to-sol or the reverse sol-to-gel transition. While the middle block B is water-soluble, the solubility of the two end blocks A can be switched by CO2. For the gel-to-sol transition, the A block was made to have a lower critical solution temperature (LCST) that can increase upon CO2 bubbling, while for the sol-to-gel transition, the A block was designed to have a LCST that decreases with CO2. Repeated cycles of hydrogel formation and dissociation could be achieved by simply passing CO2 and an inert gas alternately through the solution, at a constant temperature and without adding acids and bases for pH change. Moreover, CO2-induced release of an encapsulated protein was demonstrated.
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