【摘要】 将多壁碳纳米管(MWCNTs)水悬浮液、N-甲基吗啉-N-氧化物(NMMO)溶液及纤维素共混得到纺丝液,通过干湿法制备了Lyocell/MWCNT复合纤维。采用X-衍射仪(WAXD)、扫描电镜(SEM)、透射电镜(TEM)、强度仪等分析了所得纤维的结构和性能。WAXD图谱显示复合纤维仍然具有纤维素II晶型的结构,同时还保留了MWCNTs的特征衍射峰;二维X衍射结果表明:MWCNTs质量分数为5%的复合纤维中,MWCNTs与纤维轴的取向角为±15.2°,说明复合纤维中MWCNTs基本沿着纤维轴取向。SEM结果显示复合纤维中MWCNTs在Lyocell基体中分布均匀。对纤维的力学性能分析进一步表明:添加适量的MWCNTs可使复合纤维的力学性能提高,MWCNTs质量分数为1%的复合纤维的初始模量和强度分别比Lyocell纤维增加49.4%和15.7%。更多还原

【Abstract】 Lyocell/multi-walled carbon nanotube(MWCNT)composite fibers were prepared by the dry-wet spinning of an aqueous suspension containing MWCNTs,N-methylmorpholine N-oxide and the cellulose.The structure and properties of the composite fibers were investigated by WAXD,SEM,TEM and tensile testing.WAXD patterns showed the composite fibers had the cellulose II crystal structure and retained the characteristic peak of carbon nanotubes.The two dimension X-ray diffraction patterns showed that the composite fibers with mass fraction 5% MWCNTs had a mosaic angle of ±15.2°,which means that the MWCNTs were preferentially aligned along the axis of the fibers.The SEM showed that the MWCNTs were dispersed uniformly in the matrix.The addition of an appropriate amount of MWCNTs could improve the mechanical properties of the composite fibers.The initial modulus and tenacity of the composite fibers containing a mass fraction of 1% MWCNTs were increased by 4.49% and 15.7%,respectively,compared to the Lyocell fibers.更多还原