聚丙烯腈基碳纤维中微孔洞的一维多取向小角X射线散射研究

Multi-orientated One-dimensional Small Angle X-ray Scattering Study of Microvoids in Polyacylonitrile-based Carbon Fibers

应用一维多取向小角 X射线散射 ( SAXS)方法研究了聚丙烯腈 ( PAN)基碳纤维中微孔洞的形态 .结果表明 ,这些微孔洞沿纤维轴方向呈针状 ,并与纤维轴呈Φ=1 4°角的取向排列 ;微孔洞投影在碳纤维横截面上的平均半径 R=1 .1 4nm,投影在碳纤维轴向上的平均长度 L=1 7.97nm.建立的一维多取向 SAXS方法可以得到若干二维 SAXS方法才能得到的微孔洞形态及分布信息等参数 (如 Φ和 L) ,且在各种纤维的微孔洞或微纤维的表征方面具有一定的普适性 .

The configuration of the microvoids in polyacrylonitrile(PAN)-based carbon fibers was studied by multi-orientated one-dimensional small angle X-ray scattering. The microvoids show a preferred orientation and have needlelike shape elongating along the fiber axis,and the oriented angle is Φ=14°. the cross-section radius of the microvoids projected onto the fiber cross section is R=1.14 nm and the length projected onto the fiber axis is L=17.98 nm. The method developed in this paper reveals some aspects of the configuration of the microvoids which were only available with two-dimensional small angle X-ray scattering technique such as Φ and L,and can be applied to the characterization of the configuration of the microvoids or the microfibrils in other fiber systems. [WT5HZ]