Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers

LI Xiao-peng; SUO Xi-dong; LIU Yao-dong; LI Yong-hong

doi:10.1016/S1872-5805(19)60001-6

Volume 34 Issue 1

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LI Xiao-peng, SUO Xi-dong, LIU Yao-dong, LI Yong-hong. Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers. New Carbon Mater., 2019, 34(1): 9-18. doi: 10.1016/S1872-5805(19)60001-6

Citation:

LI Xiao-peng, SUO Xi-dong, LIU Yao-dong, LI Yong-hong. Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers. New Carbon Mater., 2019, 34(1): 9-18. doi: 10.1016/S1872-5805(19)60001-6

Citation:

LI Xiao-peng, SUO Xi-dong, LIU Yao-dong, LI Yong-hong. Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers. New Carbon Mater., 2019, 34(1): 9-18. doi: 10.1016/S1872-5805(19)60001-6

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Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers

doi: 10.1016/S1872-5805(19)60001-6

1.
CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: One Hundred Person Project of CAS, China; Natural Science Foundation of Shanxi Province (201601D011020).

Received Date: 2019-01-02
Accepted Date: 2019-02-20
Rev Recd Date: 2019-01-30
Publish Date: 2019-02-28

Abstract

Abstract

The use of gel spinning technology in the formation of polyacrylonitrile (PAN)-based carbon fibers has led to significant tensile property improvements. PAN, dimethylsulfoxide (DMSO) and dimethylformamide (DMF) solutions were dry-jet spun, gelled in methanol at -20 and -50℃ for different times from 0 to 40 d, and vacuum-dried at 0℃ for 24 h to obtain PAN fibers that were drawn to a drawing ratio (DR) of 4 in a hot glycerin bath at 110℃, and then to various DRs in a glycerin bath at 155℃. The effects of gelation time on the microstructures, mechanical properties and cyclization reactions of the gel-spun PAN fibers were investigated. Results showed that the gelation time affected the gel structure and the maximum possible draw ratio. The gelation effects were significant in the first 5-10 d, and were more prominent for the DMSO system than the DMF system. The maximum possible draw ratio, strength and modulus, orientation and crystallinity of the PAN fibers increased with gelation time. The cyclization temperature decreased and the reaction enthalpy increased with gelation time in cyclization, indicating an improved chain orientation and crystallinity with gelation time. Gelation was an important step affecting the microstructures and properties of gel-spun PAN fibers for making high performance carbon fibers.
- Polyacrylonitrile,
- Fiber spinning,
- Gelation,
- Mechanical property,
- Cyclization

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References(27)

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