Dual Stimuli-Responsive Supramolecular Hydrogel Based on Hybrid Inclusion Complex (HIC)

作者：Liu Jianghua; Chen Guosong^*; Guo Mingyu; Jiang Ming

来源：Macromolecules, 2010, 43(19): 8086-8093.

DOI：10.1021/ma101437k

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.

• 出版日期2010-10-12
• 单位复旦大学