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

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Significantly reduced pre-oxidation period of PAN fibers by continuous electron beam irradiation: Optimization by monitoring radical variation
	Zhang, WL ; Wang, MH ; Zhang, WF ; Liu, WH ; Yang, CG ; Shen, RF ; Wu, GZ
刊名	POLYMER DEGRADATION AND STABILITY
	2018
卷号	158 期号:-页码:72-82
关键词	CARBON-FIBERS GAMMA-RADIATION POLYACRYLONITRILE FIBERS THERMAL STABILIZATION PRECURSOR FIBERS N-HEXADECANE DEGRADATION ACRYLONITRILE COPOLYMERS OXIDATION
ISSN号	0141-3910
DOI	10.1016/j.polymdegradstab.2018.10.027
文献子类	期刊论文
英文摘要	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.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31104]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Jialuo Rd 2019, Shanghai 201800, Peoples R China 3.Univ China Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, WL,Wang, MH,Zhang, WF,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, WL.,Wang, MH.,Zhang, WF.,Liu, WH.,Yang, CG.,...&Wu, GZ.(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, WL,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.