Fabrication of α-CD Host-guest Recognition Supramolecular Hydrogel and Investigation on Its Macro-rheological Performance Establishment Process
α-CD/PMPEGA-2000 supramolecular hydrogel was fabricated by mixing 7 wt％α-cyclodextrin(α-CD)aqueous solution with 5 wt％methoxy polyethylene glycol(2000)methacrylate homopolymer(PMPEGA-2000)aqueous solution.The necessary condition for the formation of the hydrogel was that the volume ratio of the two aqueous solution should not be less than 1.5∶1.When the volume ratio was 2∶1,a hydrogel with the highest viscosity can be obtained.The scanning electron microscopy results confirmed that there exist three-dimensional network structures in the hydrogel.The results of thermogravimetric analysis and X-ray powder diffraction analysis indicated that the formation of the hydroygel was based on the host-guest recognition between α-CD and PMPEGA-2000.The results of optical microrheological analysis showed that the macroscopic rheological performance establishment process of the hydrogel was actually a process of an increasing in the number of host-guest recognition crosslinking points,thereby constantly enhancing the strength of the network structure.The process started at 8'36"after the mixing of α-CD aqueous solution and PMPEGA-2000 aqueous solution,and was basically completed at 64'00".The entire process took about 55'24".
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万方数据
维普
