期刊
RSC ADVANCES
卷 5, 期 64, 页码 52226-52234出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra05696a
关键词
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资金
- National High-tech Research and Development Projects (863) [2012AA03A605]
- National Science Foundation of China [51103019, 21174027]
- Program for New Century Excellent Talents in University [NCET-12-0827]
- Program of Introducing Talents of Discipline to Universities [111-2-04]
The plasticized spinning and cyclization behaviors of polyacrylonitrile (PAN) and polyacrylonitrile/ functionalized carbon nanotube (PAN/CNT-COOH) composite fibers were studied. The PAN/CNT-COOH fibers containing 0.8 wt% CNTs exhibit excellent tensile strength and modulus, i.e. 0.475 GPa and 10.93 GPa, which are 69.6% and 40.13% improvement respectively, compared to their precursor fibers. The changing trend of crystallinity of PAN/CNT-COOH fibers is associated with the heat exchange rate and oriented-crystallization rate, which can be confirmed by the X-ray diffraction (XRD) results. The cyclization behaviors of the fibers were examined using X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The results show that cyclization of PAN/CNT-COOH fibers is initiated by three types of initiating agents, i.e., modified CNTs (CNTs-COOH), oxygen containing groups generated during the plasticized spinning and comonomers. Meanwhile, the PAN/CNT-COOH fibers exhibit various cyclization behaviors induced by high spinning speeds.
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