反复拉伸法制备单壁碳纳米管定向排列的SWCNT/PMMA复合材料

SWCNT/polymethylmethacrylate (SWCNT/PMMA) composites with SWCNTs uniformly dispersed and aligned within the polymer were fabricated by a repeated stretching. A semidried mixture of SWCNTs and PMMA was treated in turn by stretching at a drawing ratio of 50 and folding, and the treatment was repeated 100times. SEM and polarized Raman spectra demonstrated that the SWCNTs in the composites tended to align in the stretching direction. The electrical conductivity and the mechanical properties of the composites improve with SWCNT concentration. The composites showed a higher electrical conductivity and improved mechanical properties such as Young’s modulus, tensile strength and elongation along the stretching direction than those along the perpendicular direction.