High-performance carbon nanofibers are highly dependent on the performance of their precursors, especially polyacrylonitrile (PAN). In this work, the copolymer of PAN (coPAN) was synthesized for electrospinning. A self-assembling set-up was used for the stretching of single coPAN nanofibers. FTIR and Raman spectroscopies were used to characterize the chemical structure of coPAN nanofibers. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to monitor the morphology of single coPAN nanofibers under different drawing times. Micro-tensile test was used to determine the mechanical properties of single coPAN nanofibers. The results indicated that the drawing led to an increase in degree of molecular orientation along the fiber axis from 0.656 to 0.808, tensile strength from 304 MPa to 595 MPa, and modulus from 3.1 GPa to 12.4 GPa. This research would provide fundamental information of high-performance electrospun coPAN nanofibers and offer opportunities for the preparation of high-performance carbon nanofibers.

高性能碳纳米纤维高度依赖其前驱物的性能，尤其是聚丙烯腈（PAN）。在这项工作中，PAN的共聚物（coPAN）被合成用于静电纺丝。自组装装置用于拉伸单根coPAN纳米纤维。FTIR和拉曼光谱用于表征coPAN纳米纤维的化学结构。使用扫描电子显微镜（SEM）和原子力显微镜（AFM）来监控在不同拉伸时间下单根coPAN纳米纤维的形态。使用微拉伸试验确定单根coPAN纳米纤维的机械性能。结果表明，该图导致沿着纤维轴的分子取向度从0.656增加到0.808，拉伸强度从304 MPa增加到595 MPa，模量从3.1 GPa增加到12。4 GPa。这项研究将提供高性能电纺coPAN纳米纤维的基础信息，并为制备高性能碳纳米纤维提供机会。