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Acta Phys. Chim. Sin.  2014, Vol. 30 Issue (4): 753-760    DOI: 10.3866/PKU.WHXB201401241
PHYSICAL CHEMISTRY OF MATERIALS     
Modification of Microvoid Defects in Polyacrylonitrile-Based Carbon Fibers by a Liquid Oligomer of Acrylonitrile
CHAI Xiao-Yan1,2, ZHU Cai-Zhen2, HE Chuan-Xin2, ZHANG Guang-Zhao1, LIU Jian-Hong2
1 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China;
2 Shenzhen Key Laboratory of Functional Polymer, College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China
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Abstract  

The strength of industrial carbon fibers (CFs) is far lower than their theoretical strength because of defects in the microstructure of carbon fibers and these are the main restrictions in improving their performance. The most effective way to improve the strength of CFs is to reduce the amount of these defects. We thus report a novel method using a liquid oligomer of acrylonitrile (LAN) to modify the defects. Briefly, Polyacrylonitrile (PAN)-based CFs T300 were infused into LAN, and subsequently oxidized in air and carbonized in nitrogen. Their tensile strength increased by 25%. Two-dimensional small angle X-ray scattering (SAXS) was used to characterize the variation in length of the microvoids (L), the chord length of cross section lp, the orientation angle (Beq), and the relative volume (Vrel). The results show that the length, orientation, angle and relative volume of the microvoids were much lower and the tensile property improved. The improvement in the tensile property comes from the modification of defects in CFs T300 by LAN. The BET method and scanning electron microscopy (SEM) were used to characterize the specific surface area and the morphology of T300 before and after LAN treatment. The results show that after the treatment of LAN the specific surface area decreased and the amount of surface defects also decreased.We further prove that the liquid oligomer of acrylonitrile can modify the defects in CFs. X-ray photoelectron spectroscopy (XPS) was used to study the chemical composition of LAN-treated CF surfaces. The results show that the relative content of oxygen-containing functional groups on the surface of the CFs (C―OH, C=O, HO―C=O) increased significantly. The increase in oxygen-containing groups enhanced the surface polarity of the CFs, improving the interaction between the treated CFs and the epoxy resin, which acts as a carbon fiber substrate. Therefore, the mechanical properties of the CFs improved.



Key wordsCarbon fiber      Microvoids defects      Modification      Liquid oligomer of acrylonitrile      Small angle X-ray scattering     
Received: 14 October 2013      Published: 24 January 2014
MSC2000:  O641  
  O5711418  
  TQ342  
Fund:  

The project was supported by the National Key Basic Research Programs of China (973) (2011CB605603, 2011CB605605) and National Natural Science Foundation of China (21304059).

Corresponding Authors: LIU Jian-Hong     E-mail: jojochai2006@126.com
Cite this article:

CHAI Xiao-Yan, ZHU Cai-Zhen, HE Chuan-Xin, ZHANG Guang-Zhao, LIU Jian-Hong. Modification of Microvoid Defects in Polyacrylonitrile-Based Carbon Fibers by a Liquid Oligomer of Acrylonitrile. Acta Phys. Chim. Sin., 2014, 30(4): 753-760.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201401241     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2014/V30/I4/753

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