Microstructures of High-strength High-modulus Carbon Fibers and High-modulus Carbon Fibers

doi:10.11777/j.issn1000-3304.2017.17102

CORC > 化学研究所 > 中国科学院化学研究所

	Microstructures of High-strength High-modulus Carbon Fibers and High-modulus Carbon Fibers
	Li, Wei-wei 1,2; Kang, Hong-liang 1; Xu, Jian 1; Liu, Rui-gang 1
刊名	ACTA POLYMERICA SINICA
	2018-03-01
期号	3 页码:380-388
关键词	High-strength High-modulus Carbon Fibers High-modulus Carbon Fibers Microcrystalline Structure Crystal Defects
ISSN号	1000-3304
DOI	10.11777/j.issn1000-3304.2017.17102
英文摘要	The differences between the microstructure and composition of high-strength high-modulus carbon fibers and those of high-modulus carbon fibers, both domestic products, are presented by laser micro-Raman scattering (Raman), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), elemental analysis (EA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). The results show that the graphite crystallites in high-strength high-modulus carbon fibers are fine (L-a = 0.543 nm, L-c = 0.301 nm). There are many defects in the plane and at the edge of the graphite sheets. On one hand, the small graphite crystallites are linked to each other by sp(3) amorphous carbons, which are shown as the wave-like and winkled ribbons in TEM images. The defects in the micro-crystallites, mainly composed of non-conjugated carbon atoms and oxygenated/ nitrous carbon, cause a relative larger space between graphite layers (d(002) = 0.343 nm) with a lower degree of graphitization (R = 1.15). The fine crystallites and defect structures have a larger orientation angle (Z = 10.33 degrees) of (002) crystal face of the graphite crystallites in the high-strength high-modulus carbon fibers. In addition, the microvoids in the high-strength high-modulus carbon fibers are smaller in size (L = 74.7 nm) and larger in orientation angle (Beq = 9.97 degrees) than those in high-modulus carbon fibers, which attributes to the mergence and development of the microvoids at the interface of graphite crystallites resulted from exhausting of the non-carbon elements during the heat treatment. The high-modulus carbon fibers have a higher degree of graphitization (R = 0.29), and the graphite crystallites are bulky and stacked orderly (L-a = 0.687 nm, L-c = 0.484 nm, d(002) = 0.337 nm, Z = 9.77 degrees). Moreover, the cracks and microvoids in high-modulus carbon fibers are larger in sizes (L = 102.4 nm) and smaller in orientation angle (B-eq = 8.11 degrees) than those in the high-strength high-modulus carbon fibers. The hierarchical structure in the high-strength high-modulus carbon fibers, including the microcrystalline structure, the microvoids and the nitrogen/oxygen doped graphite sheets, offers various paths to dispersing the stress during the stretching process of the carbon fibers, which leads to large elongation and high tensile strength for the carbon fibers.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000429431700008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/46083]
专题	中国科学院化学研究所
通讯作者	Liu, Rui-gang
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Lab Polymer Phys & Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Wei-wei,Kang, Hong-liang,Xu, Jian,et al. Microstructures of High-strength High-modulus Carbon Fibers and High-modulus Carbon Fibers[J]. ACTA POLYMERICA SINICA,2018(3):380-388.
APA	Li, Wei-wei,Kang, Hong-liang,Xu, Jian,&Liu, Rui-gang.(2018).Microstructures of High-strength High-modulus Carbon Fibers and High-modulus Carbon Fibers.ACTA POLYMERICA SINICA(3),380-388.
MLA	Li, Wei-wei,et al."Microstructures of High-strength High-modulus Carbon Fibers and High-modulus Carbon Fibers".ACTA POLYMERICA SINICA .3(2018):380-388.