Reinforcing carbonized polyacrylonitrile fibers with nanoscale graphitic interface-layers
Reinforcing carbonized polyacrylonitrile fibers with nanoscale graphitic interface-layers
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DOI：
10.1016/j.jmst.2021.03.067
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发表时间：
2021
影响因子：
10.9
通讯作者：
Rahul Franklin;Weiheng Xu;Dharneedar Ravichandran;Sayli Jambhulkar;Yuxiang Zhu;Kenan Song
中科院分区：
文献类型：
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作者：
Rahul Franklin;Weiheng Xu;Dharneedar Ravichandran;Sayli Jambhulkar;Yuxiang Zhu;Kenan Song
经过稳定化、碳化和石墨化热处理阶段的碳纤维将形成连续的石墨层，这些石墨层紧密堆积并优先沿纤维轴沿着排列，形成高的机械刚度或强度以及导电性或导热性。聚合物中不连续的粉末状石墨烯层的排列一直具有挑战性，这是由于几层甚至单层石墨烯的低弯曲模量导致聚集或折叠行为。这项研究证明了利用聚合物-纳米颗粒相互作用来排列聚丙烯腈（PAN）基质中的石墨烯纳米片（GNP）。内部设计的纺丝方法产生三层纤维，其利用每层之间的界面相互作用来使石墨层之间的石墨烯对准。这种含有取向GNP的复合材料显著提高了模量（即，42.3至74.6GPa），并增加电导率以增强挥发性有机化合物（VOC）感测行为。该研究为多层复合材料的可扩展制造提供了一种新的方法。
Carbon fibers going through stabilization, carbonization, and graphitization heat-treatment stages will form continuous graphitic layers that are closely packed and preferentially aligned along the fiber axis, forming high mechanical stiffness or strength and electrical or thermal conductivity. The alignment of noncontinuous, powder-like graphene layers in polymers has been challenging due to the low bending modulus of a few- or even single-layered graphene, which causes aggregations or folding behaviors. This research demonstrates the leveraging of polymer-nanoparticle interactions to align graphene nanoplatelets (GNPs) in the polyacrylonitrile (PAN) matrix. An in-house designed spinning method produces a three-layered fiber that utilizes the interfacial interactions between each layer for graphene alignment between graphitic layers. This composite containing oriented GNPs significantly improves modulus (i.e., 42.3 to 74.6 GPa) and increases electrical conductivity for enhancing volatile organic compounds (VOCs) sensing behaviors. This research opens up a new scalable fabrication method for multilayered composites.