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 ultrasonic etching treatment,the morphology and the chemical constitution difference between the skin and the core of the stabilized fibers from different temperature zones were studied by SEM and Raman spectrum respectively.The fibers stabilized at 195-225℃ had low stability,in which almost no difference in structure appeared between the skin and the core.The core in the fibers stabilized at 235-265℃ was dissolved by ultrasonic etching due to lower stability compared with the skin,which led to significant morphology difference between the skin and the core.After stabilized at 275℃,the stabilization of the core was improved,and the skin and the core showed infusibility.The characteristic Raman-scattering peaks of graphite broadened in the final stabilized fibers,while the peaks of the skin was broader,indicating the chemical constitution difference between the skin and the core.
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