Journal
MACROMOLECULES
Volume 43, Issue 19, Pages 8086-8093Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma101437k
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Funding
- National Natural Science Foundation of China (NNSFC) [20834004, 20904005, 20774021]
- Ministry of Science and Technology of China [2009-CB930400]
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A novel dual-responsive supramolecular hydrogel composed of an azobenzene (AZO) end-functionalized block copolymer PDMA-b-PNIPAM (AZO-(PDMA-b-PNIPAM)) and beta-cyclodextrin-modified CdS quantum clot (beta-CD@QD) has been demonstrated. Based on the host-guest inclusion complexation of AZO of the block copolymers and Cl) cavities on beta-CD@QD, they form a hybrid inclusion complex (HIC). The HIC contains a QD as the core and the block copolymer as the shell with the PNIPAM block as the outer layer. Dynamic light scattering (DLS) and UV-vis spectroscopy investigation proved the HIC structure in diluted solution. Hydrogel formed easily upon heating the aqueous solution of HIC at a concentration as low as 7 wt %; as a result of PNIPAM, aggregation occurred above the LCST. The inclusion complex and the domains of the collapsed PNIPAM chains serve as two distinct cross-links and render the hydrogel excellent dual sensitivity to competitive hosts/guests substitution and to temperature variation. Furthermore, rheology results quantitatively exhibit the hydrogel formation mechanism and the sot-to-gel reversibility following the two external stimuli.
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