Journal
POLYMER DEGRADATION AND STABILITY
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2021.109570
Keywords
PAN; Nano-fiber; Free radicals; Decay; Radiation; Thermal stabilization
Categories
Funding
- National Key R&D Program of China [2020YFA0405800]
- National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of Technology [6142910190203]
- National Natural Science Foundation of China [51772308, 11505268]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [KF1813]
Ask authors/readers for more resources
Radiation technique was found to accelerate the stabilization process of PAN nano-fibers in the production of carbon nano-fibers. The study on the evolution and decay of free radicals induced by gamma-rays irradiation revealed that irradiated samples always contained higher radical concentration, and radiation oxidation facilitated the dehydrogenation process to drive thermal stabilization.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available