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Polymers 2018, 10(9), 943; https://doi.org/10.3390/polym10090943

Effects of γ-Ray Irradiation on the Radial Structure Heterogeneity in Polyacrylonitrile Fibers during Thermal Stabilization

1
Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Chao-Yang District, Beijing 100029, China
2
Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164, China
3
SINOPEC Shanghai Petrochemical Company Limited, 48 Jinyi Road, Jinshan District, Shanghai 200540, China
*
Authors to whom correspondence should be addressed.
Received: 10 June 2018 / Revised: 8 August 2018 / Accepted: 20 August 2018 / Published: 24 August 2018
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Abstract

The radial structural heterogeneity of thermally-stabilized polyacrylonitrile (PAN) fiber is considered to be a limiting factor affecting the mechanical properties of the resulting carbon fibers. In this study, we demonstrate that a low-dose (60 kGy) γ-ray irradiation pretreatment can effectively mitigate the radial structural heterogeneity of PAN fibers after thermal stabilization. The characterization results indicate that low-dose γ-ray irradiation only affects the physical structure of PAN through decreasing its crystalline size and crystallinity, rather than inducing chemical cross-linking and/or intramolecular cyclization. It is proposed that an increased amorphous region in PAN fibers prompted by low-dose γ-ray irradiation can facilitate oxygen diffusion from skin to core during stabilization, which results in the increased structural homogeneity of stabilized PAN fibers. View Full-Text
Keywords: polyacrylonitrile fibers; radial structure heterogeneity; γ-ray irradiation; thermal stabilization polyacrylonitrile fibers; radial structure heterogeneity; γ-ray irradiation; thermal stabilization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Dang, W.; Liu, J.; Huang, X.; Liang, J.; Wang, C.; Miao, P.; An, Y.; Wang, X. Effects of γ-Ray Irradiation on the Radial Structure Heterogeneity in Polyacrylonitrile Fibers during Thermal Stabilization. Polymers 2018, 10, 943.

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