利用扫描电镜、元素分析、红外光谱、拉曼光谱等现代测试手段对聚丙烯腈(PAN)原丝及其在预氧化、碳化过程中的微观结构进行分析,探讨了纤维形貌、元素含量及有机基团等在不同热处理阶段的演变情况.研究结果表明:253℃开始出现比较明显的拉曼特征谱线,在有机-无机转变过程中碳元素的含量在60％ ～70％之间波动,完成转变后碳元素含量大幅增加,达到95％以上;随着热处理的进行,纤维直径逐渐减小,在780℃前减小较少,温度超过780℃后纤维直径大幅减小.这些结果进一步加深了对PAN纤维在预氧化、碳化过程中结构变化的理解.
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