Preparation And Properties Of Multifunctional Hydrogels With Multiple Dynamic Bonds Polyionic Liquid

With the rapid development of artificial intelligence,a kind of bionic skin-"ion skin"has attracted great attention,which can sense external stimuli like"biological skin"and simulate the somatosensory function of the human body.Although more and more researchers were committed to the development of bionic skin,it is still a challenge to develop multifunctional ionic skin material with visible,self-adhesive,antibacterial,similar mechanical properties and sensing functions to the skin.In this study,a series of multifunctional hydrogels based on multiple dynamic bonds including metal coordination bond,hydrogen bond and electrostatic interaction were successfully prepared.Specifically,choline-amino acid ionic liquids（CAA ILs）and acrylic acid（AAc）were reacted by amidation through molecular design to prepare vinyl polyionic liquid monomers（VILs）with double bond structure.The AAc,bacterial cellulose（BC）and VILs were used as raw materials,aluminum chloride hexahydrate（Al Cl₃·6H₂O）as cross-linking agent to prepare the polyionic liquid multifunctional hydrogels(D/L-P(AAc-co-CAAx)).The chemical structure,mechanical properties,self-recovery and anti-fatigue properties,self-healing properties,antibacterial properties,biocompatibility,transparency,adhesion properties,electrical conductivity,and sensing properties of the D/L-P（AAc-co-CAA）_xhydrogels were investigated through infrared spectroscopy,element analysis,tensile tests,loading-unloading tests,antibacterial performance testing,biocompatibility testing,ultraviolet spectroscopy,adhesion testing,sensor performance tests and other experimental methods.The results showed that the prepared D/L-P（AAc-co-CAA）_xhydrogels exhibited good mechanical properties,excellent self-recovery and anti-fatigue properties,good self-healing properties.The D/L-P（AAc-co-CAA）_xhydrogels also possessed excellent antibacterial properties to inhibit the growth of bacteria and prevent infection,and the biocompatibility of the hydrogel could be adjusted by controlling the type and concentration of VILs to meet the application standards of materials in biomedical field.In addition,D/L-P（AAc-co-CAA）_xhydrogels displayed high transparency and self-adhesion.More significantly,the conductivity and sensing performance of D/L-P（AAc-co-CAA）_xincreased with the increasing of VILs content,which made it show broad application prospects in the fields of sensors and artificial intelligence as an ionic skin.