| abstract |
The invention relates to the field of environment-sensitive hydrogels and aims to provide a method for preparing temperature-sensitive physical hydrogels enhanced by multiple hydrogen bonds. Including: preparing a random copolymer from 2-ureido-4[1H]-pyrimidinone methacrylate, acrylic acid and octadecyl acrylate by free radical solution polymerization, dissolving the copolymer in an organic solvent, and then Under the condition of 70-90°C, the solvent is volatilized to obtain a film; then the film is soaked in deionized water for 10-15 hours, and when the swelling equilibrium is reached, a temperature-sensitive supramolecular hydrogel is obtained. The invention adopts the method of solution pouring and solvent volatilization to prepare, which is simple and easy to implement and has high implementability. The supramolecular polymer is constructed based on the quadruple hydrogen bond of UPy, and the strong quadruple hydrogen bond force can promote the crystallization of the alkyl side chain, thereby regulating the mechanical properties of the hydrogel. The supramolecular hydrogel enhanced by multiple hydrogen bonds of the present invention is sensitive to temperature and ions, and can endow the hydrogel with shape memory properties. |