Carbon Convergence Materials Research Center, Korea Institute of Science and Technology, San 101 Eunha-ri, Bongdong-eup, Wanju-gun, Jeonbuk 565-905, Korea.
Department of Organic Materials and Fiber Engineering, Chonbuk National University, 567 baeje-daero, Deokjin-gu, Jeonju, Jeonbuk 561-756, Korea.
Sci Rep. 2016 Mar 23;6:22988. doi: 10.1038/srep22988.
Large efforts have been made over the last 40 years to increase the mechanical strength of polyacrylonitrile (PAN)-based carbon fibers (CFs) using a variety of chemical or physical protocols. In this paper, we report a new method to increase CFs mechanical strength using a slow heating rate during the carbonization process. This new approach increases both the carbon sp(3) bonding and the number of nitrogen atoms with quaternary bonding in the hexagonal carbon network. Theoretical calculations support a crosslinking model promoted by the interstitial carbon atoms located in the graphitic interlayer spaces. The improvement in mechanical performance by a controlled crosslinking between the carbon hexagonal layers of the PAN based CFs is a new concept that can contribute further in the tailoring of CFs performance based on the understanding of their microstructure down to the atomic scale.
在过去的 40 年中，人们做出了巨大的努力，通过各种化学或物理方法来提高聚丙烯腈（PAN）基碳纤维（CF）的机械强度。在本文中，我们报告了一种使用碳化过程中的缓慢加热速率来提高 CF 机械强度的新方法。这种新方法增加了 sp(3)键合碳和六方碳网络中具有季铵键合的氮原子的数量。理论计算支持了由位于石墨层间空间的间隙碳原子促进的交联模型。通过 PAN 基 CFs 的碳六方层之间的受控交联来改善机械性能是一个新概念，它可以通过原子尺度的微观结构理解来进一步改进 CFs 的性能。
