Preparation And Characterization Of New Carbon Materials And Its Composites

g-C₃N₄ is the most stable isoform of carbon nitride,which has attracted much attention because of its excellent chemical and thermal stability and multiple advantages of excellent photoelectric properties.The compound flame retardants were prepared by using urea as the precursor g-C₃N₄,and the prepared g-C₃N₄ and OMMT?ammonium hydrogen phosphate were prepared.The material composition,morphology and structure of theg-C₃N₄ and its complex flame retardants,as well as the thermal and mechanical properties and rheological properties of the composites were investigated by infrared spectroscopy,X ray diffraction,thermogravimetric analysis,extreme oxygen index,conical calorimetry,tensile properties,scanning electron microscopy and rheological properties.The main research contents include the following three aspects.1.Study on the preparation of composite materials from g-C₃N₄?OMMT?NR.the results show that the temperature of the OMMT/g-C₃N₄ T5% is significantly lower than that of the g-C₃N₄ T5%,after doping can reach 71.97% reach 71.97%,while the undoped g-C₃N₄ can drop to 2.23% when the temperature is above 730? from its thermogravimetric curve trend.The LOI of the materials increased to 22.1% and27.2%,respectively.The results showed that the OMMT/g-C₃N₄ effectively improved the thermal stability,carbon formation and flame retardancy of natural rubber.2.The composites were prepared g-C₃N₄??NH4?2HPO4? APP and PBAT.The results showed that with the increase of P content,800?wt% increased from 2.23 of pure g-C₃N₄ to 33.66,and the PHRR,THR of composite system was significantly lower than that of pure PBAT material,in which the p HRR and THR reached the lowest value,which decreased by 25.3% and 26.9%,respectively.As a result,the doping addition of phosphorus elements can improve the flame retardancy efficiency of g-C₃N₄.3.Rheological properties of PBAT/g-C₃N₄ samples were tested by rheometer.results the processing performance can be improved by heating up.The non-newtonian indexn of the PBAT/g-C₃N₄ composite system decreases with the increase of g-C₃N₄ content,and then value is 0.52 when the mass fraction is20%,which indicates that the melt of the composite system is close to the non-newtonian fluid of g-C₃N₄ content in composite system makes the system proneto network structure.