Preparation Of Sodium Alginate / Carbon Nanocomposite Fiber And Its Composites

With the rapid development of nanotechnology in the 21st century,commonly used nanomaterials mainly include graphene,carbon nanotubes(CNTs),fullerene,etc.,which have brought many unexpected novel properties.Among them,graphene material has opened a new era of research on two-dimensional nanomaterials due to its special structure,and its rich mechanical,electrical and thermal properties have become a key research field for researchers and have been used in certain practical applications.Among them,graphene fibers are widely used in the fields of wearable electronic materials,energy storage materials and multifunctional materials due to their high strength,high modulus and good flexibility,but are limited by the preparation process and lubrication of graphene fibers.Graphene fibers are rarely used as reinforcement materials,and the research on graphene fiber-reinforced resin matrix composites is still in the stage of single-filament simulation and theoretical research.Therefore,it is of great research value and scientific significance to prepare continuous and stable high-performance graphene fibers for reinforcing resin matrix composites and realize the macroscopic assembly of nanofibers in resin matrix composites.In this paper,based on the demand for new fiber materials and nanomaterials in resin-based composites,graphene oxide(GO)materials are introduced into resin-based composites in the form of fibers to design and fabricate materials with high strength,high flexibility,and good electrical conductivity.GO macro-fiber material with high stability and high thermal stability.Wet spinning method is used to design the spinning stock solution system based on sodium alginate(SA),and the optimal spinning stock solution system is determined by studying the influence of viscosity,temperature,liquid crystal and other factors on the spinning stock solution.Through the study of fiber forming mechanism and fiber formation,the optimum wet spinning process parameters for preparing SA/GO composite fibers were determined.A systematic study on the morphology,mechanical properties,electrical properties,thermal stability and wettability of the prepared SA/GO composite fibers found that when the ratio of SA and GO was 1:3,the SA/GO composite fibers The maximum tensile strength can reach277.44 MPa,the highest Young’s modulus can reach 19.31 GPa,the highest toughness can reach367.63 MPa,the highest surface energy can reach 37.95 m J/m~2,and the highest electrical conductivity of the composite fiber after reduction can reach 2801.35 S/m,and the fiber has good flexibility,uniformity and thermal stability.CNTs in GO fiber system were prepared by wet spinning method,and CNTs/GO composite fibers were prepared.Research surface When the ratio of CNTs and GO introduced is 1:2,the tensile strength,toughness and surface energy of composite fiber are increased by20.53%,55.61%and 16.84%respectively compared with GO composite fiber,and CNTs/GO composite The fiber conduction performance is stable and has more excellent heat resistance performance.The prepared GO composite fiber was used as the reinforcement material,and the surface energy was calculated based on the Acid-base model theory,and the wetting parameters of the GO composite fiber and different polymers were obtained to analyze its interfacial bonding performance with different polymers.The epoxy resin was selected as matrix.Through the study of curing kinetics,the curing process parameters of epoxy resin were determined,and GO fiber-reinforced resin matrix composites and GO fiber-reinforced carbon fiber resin-based composites with different structures were prepared by casting molding process.Through the study on the shear performance of the composite material,it was found that the maximum shear performance of the GO composite fiber/epoxy resin composite material can reach 13.82 MPa,which is 20.07%higher than that of the blank sample;GO composite fiber reinforced 3-layer and 5-layer carbon fiber The maximum shear strength of carbon fiber/epoxy resin composites can reach 35.34 MPa and 46.94 MPa,which are respectively increased by 10.48%and 21.21%compared with pure carbon fiber/epoxy resin composites.