At the micrometer scale, microfibrils with different diameters and in strip-like form are aligned parallel to the fiber axis, and these microfibrils intersect each other.

• 结果显示：在微米尺度下，预氧化纤维表面分布有粗细不一、沿轴向排列的带状微纤，微纤之间相互交叉；