Preparation And Properties Of Polymer/Carbon Nanocomposite Hydrogel

The excellent chemical and mechanical properties of polymer nanocomposite hydrogel,as well as its good biocompatibility,enable its broad application prospect in bioengineering.Carbon nanomaterial is a sort of new material at nanometer level.It can be applied to different fields due to its various good physical and chemical properties,which makes it a hot issue for research at present.Moreover,Carbon nanomaterial,mixed with other materials,can be used to prepare new composite materials,such as supercapacitor,nanocomposite hydrogel and various sensor,etc,which possess great potential application values.In particular,on account of its simplicity of preparation,excellent properties and biocompatibility,the hydrogel composed of polymer and Carbon nanomaterial arouses wide concern of researchers at home and abroad.First,a polymer/graphene oxide?GO?composite hydrogel with high mechanical properties and high self-healing properties was prepared.GO,with abundant oxygen functional groups on the surface,can form interactions such as hydrogen bonds with polymer chains,which contribute to the improvement of hydrogel's mechanical and self-healing properties.With the existence of GO,we realize the preparation of CPAM/GO hydrogel by the polymerization of free radicals between AM and DAC.The mechanical and self-healing properties of hydrogel can be adjusted with the change of the GO content and the mass ratio of AM and DAC.The ionic bonds between DAC and GO,as well as the hydrogen bonds between AM and GO enable the efficient energy consumption and the rebuilding of hydrogel network.The prepared polymer nanocomposite hydrogel has excellent stiffness?Gpa:?1.1MPa?,toughness(?9.3MJ m^-3),fatigue resistance and self-healing rate?tensile strength>92%,tensile strain>99%,toughness>93%?.Another work in this paper is to prepare composite hydrogel sensors with enhanced carbon nanotube?CNT?and high self-healing properties.Using carboxylated multi-walled CNT as nano-additives and AM and DAC as polymer monomers.Because of the large quantity of carboxyl on the surface of carboxylated multi-walled CNT,reversible hydrogen bonds and ionic bonds between CNT and polymer chains are formed to improve hydrogel's mechanical and self-healing properties.When the CNT content reaches 1wt%,the hydrogel can achieve good mechanical property,toughness,fatigue resistance and self-healing capacity at the same time.More importantly,the addition of CNT promotes the realization of the electrical conductivity of hydrogel,which,with the collaboration of its excellent mechanical property,can affect the electrical resistance by tension and compression,and therefore enables the application of hydrogel to the manufacture of pressure sensors.