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金属离子对PAN基碳纤维结构和性能的影响
引用本文:李常清,袁姗,刘晖,童元建,徐樑华.金属离子对PAN基碳纤维结构和性能的影响[J].北京化工大学学报(自然科学版),2009,36(1):40-43.
作者姓名:李常清  袁姗  刘晖  童元建  徐樑华
作者单位:北京化工大学碳纤维及复合材料研究所,北京,100029;北京化工大学碳纤维及复合材料研究所,北京,100029;北京化工大学碳纤维及复合材料研究所,北京,100029;北京化工大学碳纤维及复合材料研究所,北京,100029;北京化工大学碳纤维及复合材料研究所,北京,100029
基金项目:国家自然科学基金,国家重点基础研究发展计划(973计划),北京化工大学校青年教师科研基金 
摘    要:采用浸渍的方法,将钠、铁离子引入聚丙烯腈(PAN)纤维。经预氧化、低温碳化后,分别在1200、1300、1500℃温度下,对PAN纤维进行高温碳化处理。通过X射线衍射(XRD)、扫描电镜(SEM)、体密度、力学性能等测试手段研究了金属离子对PAN基碳纤维结构和性能的影响。结果表明,添加金属离子后,1500℃处理的碳纤维(002)面的层间距减小,碳纤维的抗拉强度降低,碳纤维的弹性模量增加;碳纤维横断面结构尺寸大小不一,结构疏松。金属离子的加入,一方面能促进碳纤维的乱层结构向石墨结构的转变,弹性模量增加;另一方面使碳纤维的缺陷增加,抗拉强度降低。

关 键 词:PAN基碳纤维  Na金属离子  Fe金属离子  催化石墨化  层间距
收稿时间:2007-12-06

Influences of metal ions on the microstructure and mechanical properties of PAN-based carbon fibers
LI ChangQing,YUAN Shan,LIU Hui,TONG YuanJian,XU LiangHua.Influences of metal ions on the microstructure and mechanical properties of PAN-based carbon fibers[J].Journal of Beijing University of Chemical Technology,2009,36(1):40-43.
Authors:LI ChangQing  YUAN Shan  LIU Hui  TONG YuanJian  XU LiangHua
Institution:Institute of Carbon Fiber and Composite, Beijing University of Chemical Technology, Beijing 100029, China
Abstract:PAN precursors were immersed in aqueous solutions of sodium or iron(Ⅲ) ions, and subsequently stabilized and carbonized at different temperatures (1200,1300,1500℃) to afford PAN carbon fibers. The influence of the metal ions on the microstructure and mechanical properties of the resulting PAN carbon fibers has been studied by XRD, density measurements, SEM and mechanical testing. The results showed that at 1500℃, addition of metal ions resulted in decreased interlayer spacing and tensile strength, and an increased modulus of the carbon fibers. After adding iron(Ⅲ) ions, the cross section of the carbon fibers had a coarse surface and loose structure. Metal ions accelerated the structural transformation from the turbostratic microstructure of PAN carbon fibers to a graphitic structure. The formation of the graphitic structure is responsible for the increased modulus of the PAN carbon fibers, whilst the observed decrease in tensile strength can be attributed to flaws induced by the presence of the metal ions. 
Keywords:PAN-based carbon fiber  sodium ion  iron(Ⅲ) ion  catalytic graphitization  interlayer spacing
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