PAN纤维中Fe的高温演变研究  

Evolution of Fe in PAN fibers during heat treatment

作　　者：刘晖[1,2] 李常清[1] 靳玉伟[1] 郭雅明[1] 徐樑华[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029 [2]吉林石化公司研究院碳纤维研究所,吉林吉林132021

出　　处：《北京化工大学学报（自然科学版）》2010年第4期48-52,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家"973"计划(2006CB605302/2006CB605303)

摘　　要：为了考察Fe对PAN基碳纤维的影响,在凝固成型阶段将Fe引入聚丙烯腈(PAN)初生纤维中,通过后续过程制备含Fe的原丝,经过预氧化、碳化处理后,收取不同阶段的纤维。借助电感耦合等离子体-原子发射光谱(ICP-AES)、电子探针(EPMA)、力学性能测试、热重分析等手段,表征不同热处理阶段PAN纤维中Fe的含量、微区分布的变化及对碳纤维性能的影响。结果表明,含Fe的PAN原丝经预氧化、低温碳化过程,PAN纤维中Fe的质量未发生改变,当热处理温度达到1450℃后Fe开始损失,经1550℃高温处理后Fe的质量大幅度降低;热处理温度高于1350℃后,Fe在PAN纤维的径向逐渐呈现外缘多、内部少的特点,Fe有向纤维外部迁移的趋势;Fe的存在及高温迁移,降低了碳纤维的拉伸强度,影响了碳纤维的热稳定性能。Polyacrylonitrile （PAN） solutions were coagulated in DMSO/H2O/Fe2（SO4）3 solutions to form a PAN precursor containing Fe. PAN fibers were obtained by preoxidation and carbonization from this precursor. The content and distribution of Fe in the PAN fibers were studied by inductively coupled plasma-atomic emission spectrometry （ICP-AES） and electron probe microanalysis （EPMA）. The properties of the carbon fibers were investigated,including their mechanical properties and thermogravimetric analysis. The results showed that the mass of Fe in the PAN fibers did not change during preoxidation and low temperature carbonization. Fe began to be lost from the PAN fibers when the temperature reached 1450 ℃,and the rate of loss increased sharply at 1550 ℃. The loading of Fe in the exterior of the PAN fiber was higher than that in the interior when the carbonization temperature exceeded 1350 ℃. The tendency of Fe to move from the interior to the exterior of the PAN fiber increased with increasing temperature. The presence of Fe resulted in a decrease in the tensile strength of the carbon fiber,and a decrease in the ablation of the carbon fiber.

关 键 词：PAN纤维 热处理 FE 微区分布 性能 

分 类 号：TQ342.31[化学工程—化纤工业]