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Small angle X-ray scattering study of microvoid evolution and pertinence of microvoid and mechanical properties in γ-irradiated CFs

机译：小角X射线散射研究γ辐照的碳纤维中微孔的演化，微孔的相关性和力学性能

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摘要

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.
机译：为了探究微孔演化的机理以及碳纤维（CFs）在γ射线辐照下的相关性和力学行为，在室温下，将T700 CFs在环氧氯丙烷（ECP）和氩气（Ar）下暴露于γ射线。小角X射线散射（SAXS）结果表明，CF的平均微孔半径从原始纤维的4.8406 nm逐渐减小到3.6868 nm（ECP）和3.4223 nm（Ar），表明γ辐照可以明显降低由于退火和重排效应，CF中的微孔。更重要的是，活性介质会扩大纤维的表面微孔，因此，在ECP中辐照的CF的微孔总体上比Ar中的大。 CFs的拉伸强度从原始纤维的5.74 GPa增加到辐照的CFs的6.78 GPa（Ar）和6.18 GPa（ECP），同时微孔减少。因此，这将是研究γ辐照过程中CF微孔演变的关键，有利于提高γ辐照CF的力学性能。

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