Citation: Zhi-xin Dong, Tao Feng, Chao Zheng, Guo-min Li, Fang-fang Liu, Xue-peng Qiu. Mechanical Properties of Polyimide/Multi-walled Carbon Nanotube Composite Fibers[J]. Chinese Journal of Polymer Science, ;2016, 34(11): 1386-1395. doi: 10.1007/s10118-016-1841-1 shu

Mechanical Properties of Polyimide/Multi-walled Carbon Nanotube Composite Fibers

a.
Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
Academy of Space Electronic Information Technology, Xi'an 710100, China

Corresponding author: Xue-peng Qiu, xp_q@ciac.ac.cn
Received Date: 3 May 2016
Revised Date: 14 June 2016
Accepted Date: 6 July 2016

Fund Project: the National Natural Science Foundation of China 51173178the National Basic Research Program of China 2014CB643604

A series of polyimide (PI)/multi-walled carbon nanotube (MWCNT) composite fibers were prepared by copolymerizing a mixture of monomers and carboxylic-functionalized MWCNTs, followed by dry-jet wet spinning, thermal imidization, and hot-drawing process. The content of the carboxylic groups of MWCNTs significantly increased when treated with mixed acid, whereas their length decreased with treatment time. Both the carboxylic content and length of MWCNTs influenced the mechanical properties of the composite fibers. Fiber added with 0.1 wt% MWCNTs treated for 4 h exhibited the best mechanical properties, i.e., 1.4 GPa tensile strength and 14.30% elongation at break, which were 51% and 32% higher than those of pure PI fibers, respectively. These results indicated that a suitable MWCNT content strengthened and toughened the resultant PI composite fibers, simultaneously. Moreover, raising draw ratio resulted in the increase of tensile strength and tensile modulus of the composite fibers.
- Polyimide fibers,
- Carbon nanotubes,
- In situ polymerization,
- Dry-jet wet spinning process,
- Mechanical properties
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