A comparison of the effect of graphitization on microstructures and properties of polyacrylonitrile and mesophase pitch-based carbon fibers
A comparison of the effect of graphitization on microstructures and properties of polyacrylonitrile and mesophase pitch-based carbon fibers
复制标题
DOI：
10.1016/j.carbon.2012.05.024
复制
发表时间：
2012-10-01
期刊：
影响因子：
10.9
通讯作者：
Yu, Tian
中科院分区：
文献类型：
--
作者：
Qin, Xianying;Lu, Yonggen;Yu, Tian
聚丙烯腈（PAN）和中间相沥青（MPP）基碳纤维在1300-2700 ℃的温度范围内进行热处理。研究了PAN基和MPP基碳纤维经高温热处理后的微观结构和力学性能。对于两个系列的碳纤维，杨氏模量随着热处理温度的增加而增加。PAN基碳纤维的拉伸强度降低，MPP基碳纤维的拉伸强度提高。在2700 ℃的HHT后，MPP基碳纤维的拉伸强度超过PAN基碳纤维。这是由于不同的原始构造和不同的构造演化路径造成的。PAN基碳纤维中碳带的物理缠结和共价交联导致石墨烯层间存在较高的剪切应力，但在HHT过程中，由于氮的去除，石墨烯结构从乱层结构向有序结构发生了广泛的转变，容易产生空隙和裂纹。对于MPP基碳纤维，它们显示出径向织构，在横截面中具有有序和平行的层堆积。因此，石墨烯层更容易堆叠并结合到相邻的石墨烯层而没有强烈的旋转，从而导致更少的空隙和裂缝。(C)2012爱思唯尔有限公司保留所有权利。
Polyacrylonitrile (PAN) and mesophase pitch (MPP)-based carbon fibers were heat treated in the temperature range of 1300-2700 degrees C. After high-temperature heat treatment (HHT), the microstructures and mechanical properties of PAN and MPP-based carbon fibers were investigated. For both series of carbon fibers, the Young's modulus increased with heat treatment temperature increasing. The tensile strength of PAN-based carbon fibers decreased, while that of MPP-based carbon fibers increased. After HHT at 2700 degrees, the tensile strength of MPP-based carbon fibers exceeded that of PAN-based carbon fibers. The results could be ascribed to the variously original structures and the different routines of structural evolution. The physical entanglements and covalent cross-links of carbon ribbons in PAN-based carbon fibers contributed to a higher shear stress between the graphene layers, however, tended to generate voids and cracks during HHT due to an extensive transformation from turbostratic to ordered structure along with nitrogen removing. For MPP-based carbon fibers, they displayed a radial texture with ordered and parallel packing of layers in the transverse section. Thus, it was easier for the graphene layers to stack and bond to the adjacent ones without strong rotations, leading to fewer voids and cracks. (C) 2012 Elsevier Ltd. All rights reserved.