High Strength Electrospun Single Copolyacrylonitrile (coPAN) Nanofibers with Improved Molecular Orientation by Drawing
High Strength Electrospun Single Copolyacrylonitrile (coPAN) Nanofibers with Improved Molecular Orientation by Drawing
复制标题
通过拉伸改善分子取向的高强度静电纺单层共聚丙烯腈 (coPAN) 纳米纤维
DOI：
10.1007/s10118-021-2516-0
复制
发表时间：
2020-11-16
影响因子：
4.3
通讯作者：
Hou, Hao-Qing
中科院分区：
文献类型：
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作者：
Xu, Tang-Cheng;Han, Dong-Hua;Hou, Hao-Qing
高性能纳米碳纤维的制备高度依赖于其原丝的性能，尤其是聚丙烯腈（PAN）原丝的性能。本文合成了用于静电纺丝的聚丙烯腈共聚物（科潘）。自组装装置用于拉伸单个科潘纳米纤维。采用FTIR和拉曼光谱对纤维的化学结构进行了表征。利用扫描电子显微镜（SEM）和原子力显微镜（AFM）对不同拉伸时间下的单根科潘纳米纤维的形貌进行了观察。采用微拉伸测试方法研究了单根科潘纳米纤维的力学性能。结果表明，拉伸使纤维的分子取向度从0.656沿着纤维轴方向增加到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。本研究为高性能静电纺丝科潘纳米纤维的制备提供了基础信息，为高性能碳纳米纤维的制备提供了可能。
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.