摘要
连续碳纳米管(CNT)纤维是由纳米级碳材料通过组装形成的微米级纤维材料。本文采用阵列纺丝法制备连续CNT纤维,通过改变纺丝工艺,考察了致密度、直径及捻角等组装参数对纤维内CNT的堆积排列结构、纤维的力学性能和电导性能的影响。结果表明,乙醇浸润可以明显提高CNT致密化程度,从而增强管间作用力,使得纤维力学及电学性能显著提升,拉伸模量、拉伸强度和电导率分别提高了121%、67%和26%;在纺丝过程中通过改变薄膜宽度调节纤维直径时,直径过小或过大都不利于提高纤维的力学性能,适中的直径在7至8μm时可以得到更高的CNT堆积密度,从而获得较高的拉伸性能;对于致密化程度较高的乙醇浸润CNT纤维,适度降低加捻程度并不显著影响纤维性能,为规模化连续制备提供了保证。
Carbon nanotubes(CNTs) can be assembled into continuous CNT fiber,for example,by the method of array spinning.In this article,effects of several assembly parameters during the spinning process were investigated,such as ethanol infiltration,fiber diameter and twist level.They all have influences on CNT arrangement and the mechanical properties and electrical conductivity of fiber.The results show that ethanol infiltration can densify CNT fibers significantly and thus enhance them.After infiltration,the elastic modulus,tensile strength and electrical conductivity of CNT fibers are increased by 121%,67% and 26%,respectively.The optimal fiber diameter of 7 ~8μm can be achieved by adjusting the width of the drawn film.For the infiltrated CNT fibers a certain decrease in twist angle does not affect the mechanical and electrical performances,making it possible for the large-scale production.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2012年第6期8-13,共6页
Fiber Reinforced Plastics/Composites
基金
国家自然科学基金
关键词
碳纳米管纤维
阵列纺丝法
浸润
力学性能
电导率
CNT fiber
array spinning
infiltration
mechanical property
electrical conductivity
