Free radical evolution and decay of PAN nano-fibers formed by irradiation and thermal stabilization

被引：9
作者：
Liu, Weihua [1 ,4 ]
Shen, Rongfang [1 ,4 ]
Liu, Simei [1 ,4 ]
Tian, Feng [1 ,3 ,4 ]
Zhang, Xiaodong [2 ]
Li, Xiuhong [1 ,3 ,4 ]
Wang, Mouhua [1 ,4 ]
Tang, Zhongfeng [1 ,2 ,4 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Mat Behav & Evaluat Technol Space En, Harbin 150001, Peoples R China
[3] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
POLYMER DEGRADATION AND STABILITY | 2021年 / 188卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
PAN; Nano-fiber; Free radicals; Decay; Radiation; Thermal stabilization; POLYACRYLONITRILE NANOFIBERS; PREOXIDATION; OPTIMIZATION; TEMPERATURE; COPOLYMER; RADIATION; OXIDATION;
D O I：
10.1016/j.polymdegradstab.2021.109570
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Radiation technique was found to accelerate the stabilization process of PAN nano-fibers in the production of carbon nano-fibers. The evolution and decay of the free radicals of electrospun PAN nano-fibers induced by gamma-rays irradiation were investigated using electron spin resonance. Mainly alkyl and polyimine radicals were formed and the total free radical concentration reached saturation of 1.3x10(19) spins/g at the dose of 200 kGy in vacuum. The free radicals were very stable with a half-life period longer than 40 days in vacuum but rapidly decayed in air. PAN nano-fibers were subject to radiation oxidation due to their small diameter when irradiated in air. The polyimine radicals were found to be more stable than alkyl radicals at room and elevated temperatures. Mainly polyene radicals were formed resulting from dehydrogenation during the stabilization process and the irradiated sample always contained higher radical concentration. The radiation oxidation facilitated the dehydrogenation to drive the thermal stabilization process. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：7
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