Hydrogel

a family of three-dimensional network hydrophilic polymer soft materials

has remarkable solid mechanical and liquid thermodynamic properties. It is flexible and has excellent characteristics of plasticity

biocompatibility as well as degradability. It also shows high stimulus response characteristics. Hydrogels prepared by traditional methods have many problems

such as toxicity

low biological activity and mechanical properties

which limits their application. This paper reviews the application and research progress of modification and preparation of functional hydrogels in recent 10 years. On the basis of the original function of hydrogels

increasing their absorption sites and mechanical strength were mainly optimized and improved. The advance preparations involved the physical modification of low molecular weights composite crosslinking and construction of multiple networks and the chemical modification of graft copolymerization method. The application and development prospect of functional hydrogel materials were introduced in medical supplies

drug delivery and remission

cell culture in biological engineering

agricultural drought resistance and food packaging respectively. Finally

this paper focused on the smart molecule imprinting hydrogels with high specific molecular recognition properties. The combination of intelligent hydrogel technology and molecular imprinting technology for the detection of trace drugs can reduce the detection cost

shorten the detection time and improve the detection efficiency. It provides reference for further development and application of hydrogels.