采用具有带型喷丝孔的喷丝板湿法纺丝制备带型聚丙烯腈纤维,研究了纺丝牵伸对聚丙烯腈截面形态和力学性能的影响,以及截面形态对聚丙烯腈纤维预氧化反应程度的影响。结果表明:凝固牵伸、一级牵伸和二级牵伸越大,得到的带型聚丙烯腈原丝截面尺寸越小,凝固阶段纤维形变率更大;带型原丝截面尺寸越小,拉伸强度越大。预氧化热处理时,带形纤维截面尺寸越小,预氧纤维体密度越大、H/C含量比值越小、O/C比值越大,表明预氧化反应程度越高。当带形纤维截面短轴尺寸大于圆形纤维直径时,其预氧纤维皮芯比越小。
The strip polyacrylonitrile fibers were prepared by wet spinning with spinneret of strip holes.The effects of spinning drafting on the cross-sectional morphology and mechanical properties of fibers were studied,as well as the effect of cross-sectional morphology on the degree of pre-oxidation reaction of fibers.The results shown that the larger the coagulation drafting,first-order drafting and second-order drafting,the smaller the cross-section size of the strip precursor,the larger the deformation rate of the fibers in the coagulation stage.The smaller the cross-section size of the strip precursor,the greater the tensile strength.The smaller the cross-section size of ribbon fibers,the larger the density,the smaller the H/C content ratio and the larger the O/C ratio of pre-oxidized fibers,indicating the higher the degree of pre-oxidation reaction.When the short axis size of the cross-section in ribbon fibers was larger than the diameter of circular fibers,the smaller the skin-core ratio of pre-oxidized fibers.
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基金资助
山东省碳纤维技术创新中心(CX2019-01)
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