Higher dose rate effect of 500-keV EB irradiation favoring free radical annealing and pre-oxidation of polyacrylonitrile fibers

doi:10.1016/j.polymdegradstab.2019.07.003

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

	Higher dose rate effect of 500-keV EB irradiation favoring free radical annealing and pre-oxidation of polyacrylonitrile fibers
	Zhang, WL ; Wang, MH ; Liu, WH ; Yang, CG ; Wu, GZ
刊名	POLYMER DEGRADATION AND STABILITY
	2019
卷号	167 页码:201-209
关键词	GAMMA-RADIATION CARBON-FIBERS ALLOY NANOPARTICLES THERMAL-PROPERTIES PAN FIBERS BEAM DEGRADATION STABILIZATION PHOTOREDUCTION ACRYLONITRILE
ISSN号	0141-3910
DOI	10.1016/j.polymdegradstab.2019.07.003
文献子类	期刊论文
英文摘要	In this study, free radicals in polyacrylonitrile (PAN) fibers induced by irradiation of 500-keV electron beam (EB) accelerator were investigated via electron spin resonance (ESR). Alkyl radicals and polyimine radicals were formed in PAN fibers after irradiation, and the relative content of the two free radicals changed with respect to the absorbed dose and dose rate. The effect of temperature on the relative content of the two radicals was investigated via analyzing the ESR spectra of alkyl radicals and polyimine radicals, and two parameters (PHR and delta PHR) were set for evaluation. The value of delta PHR was related to the temperature. The instantaneous temperature change in the PAN fibers during the irradiation process was inferred via analyzing the change in delta PHR. Changes in the free radicals in irradiated PAN fibers during the stabilization process were also understood by ESR. Irradiation induced cross-linking and decreased the temperature of pre-oxidation for the PAN fibers. Increases in the dose rate of EB irradiation efficiently induced cross-linking and also led to pre-oxidation of the PAN fiber due to heat accumulation by EB irradiation. Radiation crosslinking significantly reduced the temperature required for peroxidation, and the trend was more evident at higher dose rates. For example, the PAN fiber irradiated to 400 kGy at a dose rate of 2 kGy/s was pre-oxidized at approximately 150 degrees C while the PAN fiber irradiated to 400 kGy at a dose rate of 13 kGy/s exhibited a darker color and was pre-oxidized at approximately 130 degrees C. (C) 2019 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/331007/32080]
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.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
推荐引用方式 GB/T 7714	Zhang, WL,Wang, MH,Liu, WH,et al. Higher dose rate effect of 500-keV EB irradiation favoring free radical annealing and pre-oxidation of polyacrylonitrile fibers[J]. POLYMER DEGRADATION AND STABILITY,2019,167:201-209.
APA	Zhang, WL,Wang, MH,Liu, WH,Yang, CG,&Wu, GZ.(2019).Higher dose rate effect of 500-keV EB irradiation favoring free radical annealing and pre-oxidation of polyacrylonitrile fibers.POLYMER DEGRADATION AND STABILITY,167,201-209.
MLA	Zhang, WL,et al."Higher dose rate effect of 500-keV EB irradiation favoring free radical annealing and pre-oxidation of polyacrylonitrile fibers".POLYMER DEGRADATION AND STABILITY 167(2019):201-209.