Propetry And Application Study Of Functionalized Hydrogel With Carbon-based Dopants

Becoming a hot topic in recent years,functionalized hydrogel materials are one of the key directions of current development and research.With the development of nanotechnology and hydrogel technology,nanomaterial-doped hydrogels have attracted attention from researchers in various fields.Although some progress has been made in functionalized hydrogel with nanomaterials dopants,due to the poor interaction between semiconductor nanomaterials(such as Graphene oxide(GO),Carbon nanotubes(CNTs),etc.)and the hydrogel matrix,the improvement of its performance is still limited.Traditional hydrogel will inevitably be frozen when the temperature is lower than 0 ℃,and then lose its original excellent performance.In order to improve the above shortcomings,this thesis studies the functionalized hydrogels doped with carbon-based nanomaterials for acrylic hydrogel systems.The specific work content of this thesis is as follows:(1)The synthesis process of polymethacrylic acid(PMAA)hydrogel is explored from the feed ratio and reaction temperature,and determine the best filling ratio.PMAA hydrogel with good swelling performance(the swelling ratio is 7.72)and mechanical properties(compressive stress can reach 306.2 KPa)is obtained.(2)Improved Hummers method is used to synthesize GO with good oxidizing properties and water dispersibility,and obtained GO is introduced into the PMAA hydrogel system.The characterization results of XRD,FTIR,SEM and thermogravimetric show that the synthesis of GO-doped hydrogel has been achieved.Experiments show that the hydrogel can specifically remove cationic dyes.Taking methylene blue(MB)as an example,the adsorption performance of PMAA/GO doped hydrogel is studied.The results show that the quality of hydrogel adsorbent is positively correlated with the removal rate.It has the best adsorption effect in a neutral environment(the adsorption capacity can reach 119.01 mg/g,and the removal rate can be as high as 96.92 %).(3)Based on the principle of free radical polymerization,CNTs doped low-temperature moisturizing hydrogel through infrared light irradiation is obtained,which is characterized and tested by universal testing machine and electronic source-meter.The study shows that the introduction of glycerin allows the hydrogel maintain a wet state in a wide temperature range(-20 ℃ ～ 60 ℃),even if store at-20 ℃ for 7 days,the weight of hydrogel has only 1 % of the minor loss.The introduction of CNTs can significantly improve the mechanical properties of the hydrogel.When the mass ratio of AA/CNTs is 1.5 wt%,the compressive strength of the CNTs-doped hydrogel is 1.311 times of the undoped hydrogel.In addition,the hydrogel is subjected to 560 consecutive loading-unloading cycles under 50 % compression deformation.The result shows that the hydrogel sensor has good stability.At the same time,it is also verified that the hydrogel can be applied to human activity monitoring,and its current changes can reflect human joint activities,indicating that it has the potential to be used in wearable electronic devices to monitor human body motion.