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Ultra high density carbon fiber derived from isotactic polypropylene fiber without skin-core structure |
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| Authors: | Minghang Yang Luzhen Sun Qiongxia Liu Yu Deng Cheng Liu Nan Li Jian Xu Yousi Chen Xigao Jian |
| Institution: | 1. State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China
Liaoning Province Engineering and Technology Research Center of High Performance Resins, Dalian, China Dalian Basalt Fiber Resin Matrix Composite Engineering Research Center, Dalian, China Technology Innovation Center of High Performance Resin Materials, Liaoning Province, China;2. State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China;3. State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China Liaoning Province Engineering and Technology Research Center of High Performance Resins, Dalian, China Dalian Basalt Fiber Resin Matrix Composite Engineering Research Center, Dalian, China Technology Innovation Center of High Performance Resin Materials, Liaoning Province, China Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Science, Ningbo, China |
| Abstract: | Polypropylene (PP)-based carbon fibers were prepared by sulfonation process of isotactic PP fibers with concentrated sulfuric acid, followed by stress-less carbonization under nitrogen atmosphere. The stabilization behaviors of PP fiber under different sulfonation temperatures and time were discussed. The carbonization behavior of the stabilized PP fibers under different carbonization temperatures, as well as the mechanical performance of the obtained carbon fibers were investigated. The results indicated that linear PP molecule were effectively converted into thermally stable structure at higher temperature (≥130°C) in short time (2 h) through sulfonation-desulfonation reaction, among which ordered graphite structure has been formed prior to the carbonization process. Meanwhile, the carbon fibers were considerably densified by increasing the sulfonation temperature and carbonization temperature, and a bulk density of 1.96 g/cm3 was achieved. Moreover, the temperature and time of the sulfonation process as well as the temperature of the carbonization process were regulated, and carbon fibers with tensile strength of 262.3 MPa was obtained, which was superior to that of 208.1 MPa for the linear low density polyethylene-based carbon fibers reported previously. Isotactic PP was proved to be a promising candidate to develop carbon fibers with tunable graphite structure and mechanical performance. |
| Keywords: | bulk density carbon fiber isotactic polypropylene fiber sulfonated fiber |