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采用不同长径比、孔径及新型结构的喷丝板制备中间相沥青炭纤维,研究了喷丝板结构对中间相沥青炭纤维径向结构及性能的影响,利用SEM和XRD对中间相沥青炭纤维的径向结构进行表征。结果表明,大的长径比与小的孔径有利于提高中间相沥青在喷丝板中流动时受到的取向作用,得到的炭纤维径向辐射结构明显,新型结构的喷丝板有效利用了挤出涨大效应,降低了取向作用,得到的中间相沥青炭纤维具有无序型径向结构。随着长径比的增加,炭纤维微晶层间距d002逐渐减小,微晶厚度Lc逐渐增加,当长径比L/D=2时,炭纤维径向结构为无劈裂的辐射型,具有更高的力学性能。
The mesophase pitch carbon fibers were prepared by using spinneret with different aspect ratio, pore size and new structure. The effects of spinneret structure on the radial structure and properties of mesophase pitch carbon fiber were studied. The mesophase pitch carbon The radial structure of the fiber was characterized. The results show that the large aspect ratio and the small aperture are conducive to increasing the orientation of the mesophase pitch flowing in the spinneret. The radial radiation structure of the obtained carbon fiber is obvious. The spinneret with the new structure effectively utilizes squeezing Large effect of rising, reducing the role of orientation, the resulting mesophase pitch carbon fibers with a disordered radial structure. With the increase of the aspect ratio, the d002 of the microcrystalline layer decreases and the crystallite thickness Lc increases gradually. When the aspect ratio L / D is 2, the radial structure of the carbon fiber is a radiative without splitting, With higher mechanical properties.