Son, Su-Young Jo, A. Young Jung, Gun Young Chung, Yong-Sik Lee, Sungho 2024-01-19T20:03:46Z 2024-01-19T20:03:46Z 2021-09-02 2019-05 1226-086X https://pubs.kist.re.kr/handle/201004/120051 Commercial polyacrylonitrile (PAN) fibers, widely used as carbon fiber precursors, were treated with ultraviolet (UV) light without any photo-initiators and its effects on the structural changes of PAN were investigated. Easily accessible UV irradiation produced free radicals by breaking the C-H bonding in PAN, leading to reducing cyclization temperature and activation energy. Dynamic mechanical analysis indicated a decrease in storage modulus of PAN fibers with increasing UV irradiation time below glass transition temperature. It is suggested that UV irradiation and the subsequent thermal treatment could offer an efficient stabilization by reducing the cyclization temperature and process time. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. English 한국공업화학회 Accelerating the stabilization of polyacrylonitrile fibers by UV irradiation Article 10.1016/j.jiec.2019.01.012 1 Journal of Industrial and Engineering Chemistry, v.73, pp.47 - 51 Journal of Industrial and Engineering Chemistry 73 47 51 N scie scopus kci ART002466383 000462419300004 2-s2.0-85060440081 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article THERMAL STABILIZATION CARBON-FIBERS Polyacrylonitrile Ultraviolet irradiation Stabilization Thermal properties Dynamic mechanical analysis