| Nanocellulose?CNF?is abstracted from natural cellulose which is a linear natural polymer materials with several to dozens nanometer in diameter and hundreds or thousands of nanometers in length.Recent studies have found that CNF can also function as a surfactant or dispersion medium due to the hydrophobic site and hydrophilic functional groups over its surface,which can disperse aggregate materials efficiently.Graphene oxide?GO?and Carbon nanotube?CNT?are new type of carbon nanomaterials,with large specific surface and excellent mechanical properties,which can be used as strengthening agent in composite materials.But,due to the strong van der waals between carbon nanotubes and the surfaces lack of active group,carbon nanotubes are easily aggregation and difficult to dissolve in water and organic solvent which limit its application.So the new methods to disperse carbon nanotubes have become a research focus.In this paper,in order to develop and utilize the Guangxi distinctive plant sisal,the sisal nanocellulose was used as dispersion medium which was abstracted from sisal fiber.Using the interaction to effective disperse multiwalled carbon nanotubes?MWNT?in green medium by synergistic effects between nanocellulose and graphene oxide,and prepared high performance composite materials,which provided a reference for the application of nanocellulose in composite materials.?1?Combined with homogeneous and mechanical stirring to prepare GO/MWNT,CNF/MWNT,CNF/GO/MWNT dispersion,the dispersion of MWNT,the ratio of GO,CNF,CNF to GO was optimized and dispersion mechanism were discussed.The result indicated that60wt%GO could stabilize the MWNT dispersion via?-stacking between the multiple aromatic regions.20wt%CNF could stabilize the MWNT dispersion by electrostatic repulsion and hydrophobic to hydrophobic interaction between their hydrophobic surfaces.10wt%CNF and10wt%GO could synergetic disperse MWNT dispersion which was ascribed to the formation of hydrogen bonds between CNF and GO.?2?We used CNF as a dispersion medium,GO as a reinforcing phase,MWNT as a conducting medium,to fabricate the composite film by CNF/GO/MWNT dispersion through the vacuum filtration,and the effects of GO/MWNT contents on the performance of the film were studied.The result showed that CNF/GO/MWNT composite film tensile strength increased firstly and then decreased with the increase of GO,while the electrical and thermal performance increased with the increase of MWNT.When the contentratio of CNF/GO/MWNT was 20/10/70,the performance of the film is the best,the conductivity reached 236.07 S/m,tensile strength was 25.13MPa,the weight loss was 9.45%between 180 and 300°C,the temperature of the maximum decomposition rate is 322.69°C.SEM,TEM results showed that GO has a well-defined structure in materials,and CNF could disperse the GO/MWNT effectively.?3?CNF/GO/MWNT dispersion was prepared through the mechanical blending,CNF/RGO/MWNT aerogel was prepared through the freeze drying and thermal reduction,studying the effects of GO/MWNT contents on the electrochemical performance of the aerogel electrode.The result have showed that aerogel electrode had good reversibility and charge-discharge performance,and the specific capacitance of aerogel electrode was increased firstly and then decreased with the increase of RGO.When the content of CNF/RGO/MWNT was30/40/30,the electrode electrochemical performance was best,when the current density were0.5,0.75,1.0 A·g-1,the specific capacitance were 143.60,115.47,88.08 F·g-1.After 1000 times constant-current charge-discharge,the capacitance retention rate of aerogel electrode was as high as 95.4%which showed good stability.SEM showed that the aerogel electrode was highly connected and three-dimensional network structures. |
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