Feng Tingting, Zhao Yufen, Shi Jie, Liu Liangsen, Li Nan, Xu Zhiwei, Zhao Lihuan, Tian Xu, Mai Wei, Li Yinglin
State Key Laboratory of Separation Membranes and Membrane Processes, School of Textiles, Tianjin Polytechnic University Tianjin 300387 China
RSC Adv. 2018 Jan 9;8(5):2373-2376. doi: 10.1039/c7ra11968b.
To explore the mechanism of microvoid evolution and the pertinence of microvoid and mechanical behavior of carbon fibers (CFs) in γ-irradiation, T700 CFs were exposed to γ-rays under epoxy chloropropane (ECP) and argon (Ar) at room temperature. The results from small angle X-ray scattering (SAXS) showed that the average microvoid radius of the CFs decreased gradually from 4.8406 nm for pristine fibers to 3.6868 nm (ECP) and 3.4223 nm (Ar), indicating that γ-irradiation could obviously decrease the microvoid in CFs owing to annealing and rearrangement effects. More significantly, active media would enlarge the surface microvoid of fibers, thus the microvoid of CFs irradiated in ECP was overall larger than that in Ar. The tensile strength of CFs was increased from 5.74 GPa for the pristine fibers to 6.78 GPa (Ar) and 6.18 GPa (ECP) for the irradiated CFs along with a decrease in the microvoid. Therefore, this would provide a key to investigate the evolution of the CF microvoid during γ-irradiation, which was conducive to improving the mechanical properties of γ-irradiated CFs.
为了探究γ辐照下碳纤维（CFs）中微孔演化的机制以及微孔与力学行为的相关性，将T700碳纤维在室温下于环氧氯丙烷（ECP）和氩气（Ar）环境中进行γ射线辐照。小角X射线散射（SAXS）结果表明，碳纤维的平均微孔半径从原始纤维的4.8406 nm逐渐减小至3.6868 nm（ECP）和3.4223 nm（Ar），这表明γ辐照由于退火和重排效应可显著减小碳纤维中的微孔。更显著的是，活性介质会扩大纤维的表面微孔，因此在ECP中辐照的碳纤维的微孔总体上比在Ar中辐照的更大。随着微孔的减少，碳纤维的拉伸强度从原始纤维的5.74 GPa提高到辐照后碳纤维的6.78 GPa（Ar）和6.18 GPa（ECP）。因此，这将为研究γ辐照过程中碳纤维微孔的演化提供关键，有利于提高γ辐照碳纤维的力学性能。
