Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation

doi:10.1016/j.polymdegradstab.2018.10.027

	Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation
	Zhang, Wenli 1,2; Wang, Mouhua 1; Zhang, Wenfa 1; Liu, Weihua 1; Yang, Chenguang1,2,3 ; Shen, Rongfang 1; Wu, Guozhong1,3
	2018-12
发表期刊	POLYMER DEGRADATION AND STABILITY (IF:6.3[JCR-2023],5.9[5-Year])
ISSN	0141-3910
卷号	158 页码:72-82
发表状态	已发表
DOI	10.1016/j.polymdegradstab.2018.10.027
摘要	A self-shielded electron beam (EB) accelerator was connected to the front of a pre-oxidation furnace to evaluate the effect of radiation on the pre-oxidation of polyacrylonitrile (PAN) fibers; with this setup, PAN fibers could be irradiated and pre-oxidized in sequence to obtain stabilized fibers. Radiation effects during different temperature stages of the pre-oxidation process were analyzed by differential scanning calorimetry, Fourier-transform infrared spectroscopy, and electron spin resonance spectroscopy. The results indicated that radiation exerted significant but different effects at various stages of the pre-oxidation process. The alkane radicals induced by radiation are rapidly transformed into polyene structures and produced polyenyl radicals after a short heat treatment period. The polyenyl radicals promoted dehydrogenation and cyclization reactions and polyene structures improved the thermal stability of the PAN fibers. Therefore, radiation can greatly shorten the time required for the stabilization of PAN fibers, owing to which the time needed for each temperature stage can be reduced by a large extent. The effects of radiation on various temperature stages of the pre-oxidation process were analyzed accurately by studying the changes in the concentration of polyenyl radicals. An optimized pre-oxidation process for irradiated PAN fibers was designed, which reduced the time period required for stabilization by 75%. The optimized pre-oxidation plus continuous EB irradiation process induced good properties in the stabilized PAN fibers, in terms of fiber density, oxygen content, and degree of cyclization. Radical concentration was found to be an appropriate indicator to express the degree of pre-oxidation. (C) 2018 Elsevier Ltd. All rights reserved.
关键词	PAN fibers Pre-oxidation Irradiation ESR Radical concentration Optimization
收录类别	EI ; SCIE ; SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Science[XDA 21080101]
WOS研究方向	Polymer Science
WOS类目	Polymer Science
WOS记录号	WOS:000452930600008
出版者	ELSEVIER SCI LTD
EI入藏号	20184506038513
EI主题词	Cyclization ; Differential scanning calorimetry ; Electron beams ; Fibers ; Fourier transform infrared spectroscopy ; Irradiation ; Magnetic moments ; Optimization ; Organic compounds ; Oxidation ; Paramagnetic resonance ; Polyacrylonitriles ; Radiation effects ; Spinning (fibers) ; Stabilization ; Thermodynamic stability
EI分类号	Thermodynamics:641.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Chemistry:801 ; Chemical Reactions:802.2 ; Organic Compounds:804.1 ; Organic Polymers:815.1.1 ; Fiber Chemistry and Processing:819.3 ; Optimization Techniques:921.5 ; Temperature Measurements:944.6
WOS关键词	CARBON-FIBERS ; GAMMA-RADIATION ; POLYACRYLONITRILE FIBERS ; THERMAL STABILIZATION ; PRECURSOR FIBERS ; N-HEXADECANE ; DEGRADATION ; ACRYLONITRILE ; COPOLYMERS ; OXIDATION
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/28720
专题	物质科学与技术学院_硕士生物质科学与技术学院_特聘教授组_吴国忠组
通讯作者	Wu, Guozhong
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Jialuo Rd 2019, Shanghai 201800, Peoples R China 2.Univ China Acad Sci, Beijing 100049, Peoples R China 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Zhang, Wenli,Wang, Mouhua,Zhang, Wenfa,et al. Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation[J]. POLYMER DEGRADATION AND STABILITY,2018,158:72-82.
APA	Zhang, Wenli.,Wang, Mouhua.,Zhang, Wenfa.,Liu, Weihua.,Yang, Chenguang.,...&Wu, Guozhong.(2018).Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation.POLYMER DEGRADATION AND STABILITY,158,72-82.
MLA	Zhang, Wenli,et al."Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation".POLYMER DEGRADATION AND STABILITY 158(2018):72-82.