Liu Jie, Yue Zhongren, Fong Hao
College of Materials Science and Engineering, Beijing University of Chemical Technology, Chaoyang District, Beijing, PR China.
Small. 2009 Mar;5(5):536-42. doi: 10.1002/smll.200801440.
Continuous nanoscale carbon fibers can be developed by stabilization and carbonization of highly aligned and extensively stretched electrospun polyacrylonitrile copolymer nanofiber precursor under optimal tension. These carbon fibers, with diameters of tens of nanometers, are expected to possess a superior mechanical strength that is unlikely to be achieved through conventional approaches. This is because i) the innovative precursor, with a fiber diameter approximately 100 times smaller than that of conventional counterparts, possesses an extremely high degree of macromolecular orientation and a significantly reduced amount of structural imperfections, and ii) the ultrasmall fiber diameter also effectively prevents the formation of structural inhomogeneity, particularly sheath/core structures during stabilization and carbonization.
通过在最佳张力下对高度取向且充分拉伸的电纺聚丙烯腈共聚物纳米纤维前驱体进行稳定化和碳化处理，可以制备出连续的纳米级碳纤维。这些直径为几十纳米的碳纤维，有望具备优异的机械强度，而这是传统方法难以实现的。这是因为：i）这种创新的前驱体纤维直径比传统的小约100倍，具有极高的大分子取向度和显著减少的结构缺陷数量；ii）超小的纤维直径还能有效防止结构不均匀性的形成，尤其是在稳定化和碳化过程中防止鞘/芯结构的形成。
