利用扫描电镜和透射电镜研究了聚丙烯腈(PAN)纤维在湿法纺丝工艺中的微观形貌与结构演变.测试分析证实,初生纤维的结构会遗传至PAN原丝,PAN原丝为皮芯多层结构,最外面是一层极薄的表皮,向内依次为表层、内层、芯部.表皮的片层结构薄且致密,其分子链结晶度高且晶粒沿轴向取向度好.柱状表层的层状结构中晶粒分布均匀、沿轴向定向较好.由表皮至内层,层状结构的厚度逐渐增加,芯部组织较疏松.建立了PAN原丝的结构模型.
The morphology and the structural interrelationship of PAN fibers in wet-spinning have been analyzed by the means of Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM). The results indicated that the structure of PAN precursor fibers was inherited from that of nascent fibers. PAN precursor fibers were composed of four parts. The sheet-like skin which had high crystallization and highly oriented structure was compact and homogeneous. The core which had low crystallization was loose and disorderly. Meanwhile, the precursor fibers had a pillar-like layered structure along the fiber axis. From the skin to the endothecium, the average thickness of each layer increased gradually. Furthermore, a structural model of PAN precursor fibers has been established.
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