Research On The Preparation And Technology Of Carbon Nanotubes/ Polysilane Composite Materials Via In-situ Polymerization

Carbon nanotubes have high stability and good electric conductivity. It depends on the π electron delocalization, but for the performance on the metal mold or semiconductor type it is the ideal one dimensional quantum wire. Polysilane is σ electronic conjugate system that is similar to π electronic conjugate system. The side chain groups of polysilane are different, so the electric properties are different. The photoelectric properties of hyperbranched polysilane are better than that of linear polysilane. The combination research of hyperbranched polysilane and multi-walled carbon nanotubes will make outstanding contributions to developing new type of conductive polymer materials, which also can fill the blank of our country in this respect.In this paper the main research content is:Via in-situ polymerization, carbon nanotubes in existence condition, using Wurtz reaction, it.can synthesis complex of carbon nanotubes/poly(methyl phenyl-methyl)silane and carbon nanotubes/poly(diphenyl-methyl)silane. Respectively by means of orthogonal tests, the purpose of them is to improve compound conductivity. Through the analysis of the range, we can find the optimal synthesis of conductive compound route and according to the conditions synthesis complex A17 of carbon nanotubes/poly(methyl phenyl-methyl)silane and complex B10 carbon nanotubes/poly(diphenyl-methyl)silane. As a contrast of A17 and B10, we synthesis poly(methyl phenyl-methyl)silane and poly(diphenyl-methyl)silane using Wurtz reaction. Through the infrared spectra, transmission electron microscopy, we can analysis and characterize the products. Through the dispersion, we can investigate the composite situation. Through the thermal weight and conductivity measurement of products, we can test the performance.Experimental analysis results show that:All benzene ring related characteristics of vibration absorption of complex move to low wave number direction compared with pure hyperbranched polysilane. Carbon nanotubes surface of the compounds obviously was enshrouded by comparatively thick polysilane. Carbon nanotubes surface becomes rough. The thermogravimetric curve of complex is clearly different from that of carbon nanotubes and polysilane, which can indicate there is strong interaction force between carbon nanotubes and hyperbranched polysilane and the complex is stable. From the scattered photos, we can see the dispersion of carbon nanotubes has improved through compositing. Seen from the conductivity, the conductivity of complex An increases the three orders of magnitude compared with poly(methyl phenyl-methyl)silane, the conductivity of complex Bio increases the two orders of magnitude compared with poly(diphenyl-methyl)silane. But the complex conductivity is lower than raw material carbon nanotubes.