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	Mass dsc/tg and ir ascertained structure and color change of polyacrylonitrile fibers in air/nitrogen during thermal stabilization
	Sun, Tongqing1,2; Hou, Yongping1,2; Wang, Haojing1
刊名	Journal of applied polymer science
	2010-10-05
卷号	118期号:1页码:462-468
关键词	Polyacrylonitrile (pan) fiber Differential scanning calorimetry (dsc) Ftir Mass spectrometry Structure change Color change Thermal stabilization
ISSN号	0021-8995
DOI	10.1002/app.32175
通讯作者	Wang, haojing(hjwang@sxicc.ac.cn)
英文摘要	The structure evolution was studied by mass spectrum (ms), differential scanning calorimetry (dsc) and thermogravimetry (tg), fourier transform infrared (ftir) spectroscopy. the results indicated that the c=n and c=c groups appeared gradually with the increase of the temperature in air and nitrogen. the c=o groups appeared because of oxidative reaction in air. the c=n, c=c and c=o groups were all chromophores. the effect of conjugated c=n and c=c on the absorption of the visible light was shifted to longer wavelengths and indicated pi-pi* transition. there was a strong bathochromic effect as the number of c=c bonds were increased. the effect of c=o and -nh(2) on the absorption of the visible light was shifted to longer wavelengths and indicated n-pi* transition. oxygen could facilitate chemical reactions in air. hence, the color of pan in air was deeper than in nitrogen at the same temperature. the structural change of pan in air was faster and more complex than in nitrogen. pan fibers treated in air turned black after 230 degrees c. however, pan fibers turned black at 350 degrees c in nitrogen. the ms and ftir indicated that cyclization occurred before dehydrogenation during stabilization in air and nitrogen. (c) 2010 wiley periodicals, inc. j appl polym sci 118: 462-468, 2010
WOS关键词	OXIDATIVE STABILIZATION ; PAN FIBERS ; DEGRADATION ; PYROLYSIS ; POLYMERS ; POLYMETHACRYLONITRILE ; OXYGEN
WOS研究方向	Polymer Science
WOS类目	Polymer Science
语种	英语
出版者	JOHN WILEY & SONS INC
WOS记录号	WOS:000280536400060
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2412167
专题	中国科学院大学
通讯作者	Wang, Haojing
作者单位	1.Chinese Acad Sci Taiyuan, Key Lab Carbon Mat, Inst Coal Chem, Taiyuan 030001, Shanxi, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Sun, Tongqing,Hou, Yongping,Wang, Haojing. Mass dsc/tg and ir ascertained structure and color change of polyacrylonitrile fibers in air/nitrogen during thermal stabilization[J]. Journal of applied polymer science,2010,118(1):462-468.
APA	Sun, Tongqing,Hou, Yongping,&Wang, Haojing.(2010).Mass dsc/tg and ir ascertained structure and color change of polyacrylonitrile fibers in air/nitrogen during thermal stabilization.Journal of applied polymer science,118(1),462-468.
MLA	Sun, Tongqing,et al."Mass dsc/tg and ir ascertained structure and color change of polyacrylonitrile fibers in air/nitrogen during thermal stabilization".Journal of applied polymer science 118.1(2010):462-468.

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