Research On Multifunctionality And Application Of Carboxymethyl Cellulose Hydrogel

Natural polysaccharide polymers are currently abundant,renewable,and environmentally-friendly resources stored in nature.They are widely used in many fields such as marine sewage treatment,biomedicine,food engineering,artificial intelligence and so on.The natural polysaccharide hydrogel inherits the advantages from natural polysaccharide,and has many specific properties due to its special porous structure.It has great application potential in the fields of biomedicine,artificial intelligence and water treatment.Cellulose is the most widely distributed,most productive,renewable and degradable natural polysaccharide polymer on the earth.As its derivative,carboxymethyl cellulose inherits the advantages of cellulose.Because of a large number of carboxyl groups in its chain,carboxymethyl cellulose solves the problem that it is difficult to dissolve and makes it more convenient.Dopamine(DA)is a hormone and neurotransmitter secreted by the brain,which is easily oxidized to polydopamine(PDA)in an alkaline environment.PDA has good biocompatibility,super bioadhesion and more active sites.In our work,carboxymethyl cellulose and dopamine are used as raw materials.Based an all-natural strategy,combining sol-gel method to prepare a versatile CMC-based hydrogel.First,the chemical structure and microstructure of the hydrogel has been analyzed.And its mechanical properties,rheological properties,adhesion and biocompatibility were unfolded.Our work is focused on exploring its self-healing and superabsorbent properties.And the practical application of self-healing and superabsorbent properties were carried out.Research content and results are as follows: Based on the all-natural strategy,an interpenetrating network was designed via simple amidation and oxidative self-polymerization with carboxymethyl cellulose and dopamine in this work.This hydrogel could not only self-heal completely after destruction(3h 98.37%),but also had high sensitive feature(GF=4.741)so that it could detect various body movements(even throat vocalization and pulse beat)in real-time as a sensor.The hydrogel has super strong adhesion(427±4 KPa),so that the hydrogel can fit human skin without additional adhesives.Thanks to its unique network structure,excellent self-healing properties,super-adhesion and high sensitivity,this versatile hydrogel can be expected to serve as a novel smart skin system with remarkable intelligent wearable properties.The prepared hydrogel also has superabsorbent and water-retention based on a highly absorbent polymer-carboxymethyl cellulose.The Equilibrium swelling rate of the hydrogel prepared by carboxymethyl cellulose and dopamine is 552.044-1109.712g/g,the water absorption speed is 0.554-1.285 g/min,and the water-retention rate is70.5-84%.The prepared hydrogel could store a large amount of absorbed water firmly,and then release it to meet the needs of plant slowly during application due to its strong water-retention properties.Most importantly,the superabsorbent and water-retetion hydrogel solves the problem of environmental pollution caused by the non-degradable resin in the field of superabsorbent materials.The hydrogel can be slowly degraded in agriculture to provide N fertilizer for the growth of plants.Hence,CMC/PDA hydrogel has potential application in water-preserving and fattening in agriculture.