Comparative Study on the Properties of Carbon Nanotubes and Carbon Black Modified Polyurethane
To explore the application values of carbon nanotubes(CNTs)and carbon black(CB)in the flexible electronic materials,and choose the appropriate conductive fillers with the more commercial and industrial applications,CNTs/polyure thane(TPU)and CB/TPU composite materials were prepared by the solution blending method.The mechanical,electrical,force-sensitive,and thermal properties of CNTs/TPU and CB/TPU composites were investigated comparatively.The results indicate that when the mass fraction of CB is 25％and the mass fraction of CNTs is 20％,the percolation thresholds of corresponding TPU flexible materials could be reached.CB and CNTs could significantly increase the Young modulus of TPU flexible materials.However,when the mass fraction of CB is greater than or equal to 4％,the Young modulus shows a decreasing trend.When the mass fraction of CB is greater than or equal to 8％,the mass fraction of CNTs is greater than or equal to 10％,the elongation at break of the composite materials shows a significant downward trend.At a certain extension amplitude,the force-sensitive performance of CB/TPU composite material is superior to that of CNTs/TPU composite material.The addition of CB and CNTs could increase the crystallization temperatures of TPU flexible composite materials.However,the excessive amount of CNTs could lead to a decrease of the crystallization temperature.With the same conductive filler mass fraction,CB has the lower market price and wider industrial application prospects.Therefore,in the application fields of TPU flexible conductive composite materials,CB is recommended as a conductive filler.
万方数据
维普
