Experimental Research And Fractal Microscopic Characterization Of Graphene/natural Rubber Composites

Graphene itself has excellent mechanical,optical,thermal and electrical properties,and has important application prospects in all research fields such as materials,chemistry,physics,and biology.Graphene is filled into natural rubber as an excellent filler to prepare graphene natural rubber composite materials.There are three common processes of melt blending,solution blending and emulsion blending,in order to improve the dispersion of graphene in the natural rubber matrix.In this work,graphene natural rubber composites were prepared by mechanical blending,and various tests were conducted on the experimental samples to obtain their measurement results.The mechanical properties,thermal conductivity,dynamic mechanical properties,and electrical conductivity of the composites were analyzed.The study found that when the mass fraction of graphene is 3g,the thermal conductivity will continue to increase with increasing temperature.Compared with no graphene,3g graphene has better mechanical properties,better thermal conductivity,better wear resistance,and the smallest loss factor in dynamic mechanical properties,which greatly reduces rolling resistance.The multi-index orthogonal test is designed,and the magnitude of the range R is calculated.The significance order of various factors for each index is: tensile strength C?A?B,elongation at break A?C?B.A good test condition for the tensile strength index is A3B4C1,and a good test condition for the elongation at break index is A4B4C1.Among the calculated true stress and true strain values,the test condition is that the value of A3B3C1 is the largest,and it is good after comprehensive balance the test conditions are A3B4C1,and the mass fractions of the factors are 41 g carbon black,4g graphene,and 1g white carbon black respectively.The maximum true strain in the corresponding mechanical properties is 139.8% and the maximum true stress is 85.695 MPa.The application of fractal theory in the microscopic characterization of graphene natural rubber composites is introduced.First,the microscopic characteristics of the composites are described in terms of filling fraction and reunion.Then introduced several classifications of fractal dimension,and then selected the box dimension to calculate the processed image,and used a variety of edge detection methods and multiple variable threshold segmentation methods in the process of processing the image,and selected the most effective and reasonable one Method to perform image processing,and calculate the box dimension,and finally summarize and analyze the calculation results.The study found that both the filling fraction feature and the agglomeration feature can better describe the micro-features of the composite material;the Sobel edge operator is the best detection operator among many kinds of edge detection,the Sobel operator Not only can it suppress the interference of noise in the image,but also process the image with gray gradation better,so the Sobel operator can better reflect the characteristics of the image for image analysis.Otsu threshold segmentation is the best threshold segmentation method among the three threshold segmentation methods.The threshold value obtained by Otsu threshold segmentation method can almost contain all the information features in the image,and the calculated box dimension is the most accurate.