聚丙烯腈纤维预氧化工艺条件对孔隙结构的影响

The Effects of Thermal Stabilization Processing on the Pore Structure of Polyacrylonitrile Fiber

借助场发射扫描电镜和小角X-射线散射对聚丙烯腈纤维的孔隙结构进行了研究。结果表明,聚丙烯腈纤维中的孔洞多为长条形且具有取向性的微孔。在预氧化温度区域,孔隙结构参数(平均孔径和孔隙率)变化不明显;但随着拉伸比的增大,其均呈下降趋势。因此,对聚丙烯腈纤维孔隙结构在预氧化过程中演变情况的研究,为进一步探讨孔隙结构对预氧化过程的影响奠定了基础。

The PAN pore structure including porosity and average pore size of fiber was characterized by FE-SEM and SAXS. The experimental results showed that there were slit-pore struetures with some orientation mieropores in the fiber. The pore structure diameter was constant during the oxidative temperature zone and reduced with the increasing stress. The acknowledgement of pore structure in the PAN fiber pave the way for the studying of the effects to the oxidative stabilization.