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Chinese Journal of Materials Research  2014, Vol. 28 Issue (8): 573-578    DOI: 10.11901/1005.3093.2014.039
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Carbonization Treatment on Performance of Carbon Fibre Reinforced Polyimide Composite Materials
Yujie KOU,Yongan NIU,Jiupeng ZHAO,Junkai LIU,Yao LI()
Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080
Cite this article: 

Yujie KOU,Yongan NIU,Jiupeng ZHAO,Junkai LIU,Yao LI. Carbonization Treatment on Performance of Carbon Fibre Reinforced Polyimide Composite Materials. Chinese Journal of Materials Research, 2014, 28(8): 573-578.

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Abstract  

A carbon fiber reinforced polyimide composite material (CF/PI) was prepared by compression molding. Then the effect of carbonization treatment on the change of structure and property of CF/PI was studied. The results show that the weight loss of CF/PI is obvious during carbonization treatment at temperature from 500℃ to 800℃, implying the occurrence of the rupture of imides rings along C-N bonds, i.e. reactions of dehydroxylation and dehydrogenation occur successively. After carbonization, molecules of CF/PI are in a state of disorder, thus its mechanical performance falls sharply; at temperature from 800℃ to 1000℃, with the recombination of functional groups within molecules, carbon layer structure forms gradually in the composite, while the characteristic diffraction peak (110) of carbon may be detected and correspondingly the mechanical strength reaches the maximum for the composite carburized at 900oC. The interfacial bond of the composite is enhanced with the increasing carbonization temperature, which is resulted from the heat activated interaction of polyimide with carbon fiber. The best comprehensive performance can be obtained for the CF/PI after carbonization treatment at 900℃.

Key words:  composite materials      CF/PI carbonization      structural changes      mechanical property     
Received:  16 January 2014     

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2014.039     OR     https://www.cjmr.org/EN/Y2014/V28/I8/573

Fig.1  Hot imidization gradient image of PI film and CF/PI
Fig.2  TG-DTA curves of (a) PI and (b) CF/PI in nitrogen environment
Temperature PI CF/PI PI in CF/PI
600℃ 29.24 16.04 25.56
700℃ 43.99 80.64 30.85
800℃ 50.18 74.28 40.98
900℃ 52.13 73.61 42.05
1000℃ 54.76 68.28 50.54
Table 1  Weight loss ratio of PI, CF/PI and PI in CF/PI after carbonization at different temperature (%)
Fig.3  Section scanning images of CF/PI after carbonization at different temperature (a) room temperature; (b) 600℃; (c) 700℃; (d) 800℃; (e) 900℃; (f) 1000℃
Fig.4  XRD spectra of (a) PI and (b) CF/PI after carbonization at different temperature
Fig.5  The FTIR spectrum after (a) CF/PI and (b) PI carbonization at different temperature
Fig.6  PI molecule structure
Fig.7  CF/PI flexure strength at different carbonization temperature
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