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Frontiers of Chemistry in China

ISSN 1673-3495

ISSN 1673-3614(Online)

CN 11-5726/O6

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Front Chem Chin    2009, Vol. 4 Issue (1) : 110-113    https://doi.org/10.1007/s11458-009-0004-0
RESEARCH ARTICLE
Properties of partially hydrolyzed PAN fibers
Zhaowen CHEN(), Wenguo XU
School of Science, Beijing Institute of Technology, Beijing 100081, China
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Abstract

The properties of base PAN (polyacrylonitrile) fibers and their partially hydrolyzed PAN-COOH fibers were characterized by means of a Fourier transform infrared spectrophotometer, elemental analyzer, specific surface area analyzer etc. The main factors that can affect the strength of the base PAN fibers and how the hydrolysis reaction happens in alkaline conditions are discussed. Acidic hydrolyzed PAN-COOH fibers, having a strength of 9.6 cN/dtex, capacity of 0.26 mmol/g, BET area of 0.58 m2/g (calculated on dry basis) were prepared. The conversion rate from -CN to -COOH, the ways that groups of -COOH array on the surface of the fibers and the possible maximum amounts of -COOH are discussed in detail.
Keywords polyacrylonitrile      fiber      hydrolysis      ion-exchange fiber     
Corresponding Author(s): CHEN Zhaowen,Email:chenzw@mail.718.ac.cn   
Issue Date: 05 March 2009
 Cite this article:   
Zhaowen CHEN,Wenguo XU. Properties of partially hydrolyzed PAN fibers[J]. Front Chem Chin, 2009, 4(1): 110-113.
 URL:  
https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0004-0
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I1/110
Fig.1  
Fig.2  Infrared Spectrum of Base PAN Fibers
Fig.3  Infrared spectrum of partially hydrolyzed PAN-COOH Fibers
fibersW/%Diameter/μmSurface area/(m2·g-1)Pore-volume/(m3·g-1)Broken strengthcN/dtexRate of broken stretch/%
CHN
PAN66.806.1923.2816 (dry)0.1880.0269.66.91
PAN-COOH66.356.1822.2610 (dry), 12 (wet)0.5800.0518.35.62
Tab.1  Comparison of properties of base PAN fibers and partially hydrolyzed PAN-COOH fibers
Array forms of -COOH groups on fiber surfaces/m2m(-COOH)/(mmol·g-1)
Balls (D, 0.522 nm)2.14 × 10-190.0045
Columns (D, 0.143 nm)1.61 × 10-200.0602
Columns (D, 0.132 nm)1.37 × 10-200.0703
Tab.2  Possible maximum amounts of -COOH on partially hydrolyzed PAN-COOH fibers
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