Study On Synthesis And Properties Of Cellulose Microgels

Energy is an indispensable substance in people’s lives and also determines economic development.Traditional fossil fuels such as petroleum and coal provide energy for people,but also come with huge costs.In recent years,with the continuous consumption of fossil fuels,its shortage risk has increased,and the carbon dioxide generated during its use will exacerbate the greenhouse effect,change the traditional energy structure,and look for alternative energy sources.As the most abundant biomass in nature,cellulose has attracted widespread attention.However,due to the large hydrogen bond network structure in cellulose,its crystallinity is very high,which makes its application more limited.In this paper,cellulose is encapsulated into a microgel,and different chains are synthesized by changing the cellulose concentration.The number of cellulose microgels effectively controls the size of cellulose crystallinity,and explores the relationship between the crystallinity of cellulose microgels with different chai’n numbers and their hydrolytic and electrochemical properties.The main contents are as follows:(1)The existing cellulose application idea is to use cellulase hydrolysis to obtain ethanol fuel through fermentation.Due to the high crystallinity of cellulose,the hydrolysis efficiency of cellulase is affected.We use absorbent cotton as raw material and use NaOH/urea/water system to dissolve to obtain cellulose solution.It was wrapped in situ in the microgel.The cellulose microgels with different chain numbers were synthesized by controlling the concentration of cellulose solution.The morphology and basic properties of cellulose microgels were characterized by using instruments.It was found that the higher the cellulose concentration,the more the number of wrapped chains.Many,the crystallinity continues to increase.Finally,the cellulose microgel was hydrolyzed,and the yields of reducing sugar and glucose under different hydrolysis times were measured by the dinitrosalicylic acid method and the glucose detector method,respectively.It was found that the smaller the crystallinity,that is,the chain of the wrapped cellulose The lower the number,the higher the hydrolysis efficiency;but when the number of chains is 9 chains,cellulose starts to crystallize inside the microgel,and the hydrolysis efficiency decreases.(2)Lithium batteries are an effective way to achieve efficient energy storage under the energy crisis.Its separator allows lithium ions to be transmitted between two electrodes and affect the electrochemical performance of the battery.We use microcrystalline cellulose as the raw material and use BMIMCI The system dissolved it to synthesize cellulose microgels with different chain numbers,which effectively controlled the degree of cellulose crystallinity.It was coated on the PET separator of a lithium battery,and it was found that the decomposition voltage and ionic conductivity of the battery were improved compared with those before coating,and the fewer the number of cellulose chains wrapped,the smaller the crystallinity,and the The larger the decomposition voltage,the greater the ionic conductivity.When the number of chains is 94,the cellulose inside the microgel begins to crystallize,and the ionic conductivity decreases.