Influence of boric acid on radial structure of oxidized polyacrylonitrile fibers

The surface modification of polyacrylonitrile (PAN) fibers with boric acid was utilized to modulate the homogeneity of the radial structure of the PAN fibers during thermal stabilization. Exothermic peaks of the fibers were put off by boric acid, and unreacted nitrile groups of the oxidized PAN fibe...

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Bibliographic Details
Published in:e-Polymers 2019-05, Vol.19 (1), p.79-86
Main Authors: Wang, Xue-Fei, Zhu, Xiao-Long, Jiang, Chi, Guan, Jian-Min, Qian, Xin, Song, Shu-Lin, Zhang, Yong-Gang, Li, De-Hong
Format: Article
Language:English
Subjects:
boric acid
Boron fibers
Carbon fibers
Materials science
Polyacrylonitrile
polyacrylonitrile fibers
Polymers
Preservatives
radial structure
Stabilization
Sulfuric acid
thermal stabilization
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Summary:The surface modification of polyacrylonitrile (PAN) fibers with boric acid was utilized to modulate the homogeneity of the radial structure of the PAN fibers during thermal stabilization. Exothermic peaks of the fibers were put off by boric acid, and unreacted nitrile groups of the oxidized PAN fibers increased with the boron content, indicating that boric acid on the fiber surface had an retardant effect on the thermal stabilization of PAN fibers. The relative skin thicknesses of the oxidized PAN fibers were quantitatively measured by sulfuric acid etching and SEM observation. The value increased obviously with the boron content, which could be further elevated by increasing stabilization time or decreasing stabilization temperature. Oxidized PAN fibers with more homogeneous radial structure can thus be obtained with the modification of boric acid, which might be beneficial for the preparation of high performance carbon fibers.
ISSN:2197-4586
1618-7229
DOI:10.1515/epoly-2019-0010