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预氧化各温区纤维经超声蚀刻处理后,利用扫描电镜(SEM)观察其皮层和芯部的形貌差异,并借助Raman光谱证实了预氧化纤维皮层和芯部的化学结构差异。结果表明预氧化初期195～225℃预氧化纤维整体预氧化程度低,纤维皮层和芯部的结构几乎没有差异;预氧化中后期235～265℃预氧化纤维芯部的稳定化程度较皮层低,芯部被蚀刻溶解,皮、芯形貌差异明显;经275℃预氧化后,纤维芯部稳定化程度提高,无论皮层还是芯部都呈现不溶性;最终的预氧化纤维出现了宽化的石墨特征Raman散射峰,但皮层的衍射峰较芯部更为宽化,反映出皮、芯化学结构的差异。
After pre-oxidation, the fibers in each temperature zone were ultrasonically etched and the morphological differences of the cortex and core were observed by scanning electron microscopy (SEM). The chemical structure differences between the pre-oxidized fiber cortex and the core were confirmed by Raman spectroscopy. The results showed that the preoxidation fibers at 195-225 ℃ had little pre-oxidation in the initial stage of pre-oxidation, and there was almost no difference in the structure of the fiber cortex and the core. Pre-oxidation stabilized at 235-265 ℃ in the pre- The core is etched and dissolved, and the skin and core morphology are obviously different. After pre-oxidation at 275 ℃, the degree of stabilization of the fiber core is increased, and no matter whether the skin or the core is insoluble, the final preoxidized fiber has a widened graphite character Raman scattering peak, but the diffraction peak of the cortex is wider than that of the core, which reflects the difference of the chemical structure between the skin and the core.