聚丙烯腈预氧丝皮芯结构的影响因素与防控措施  

Skin-core structure of polyacrylonitrile preoxidized fibers and the preventing measures

作　　者：于美杰[1,2] 王威强[2] 王启芬[1] 马婕[1] 胡秀颖[1] 王成国[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]山东大学机械工程学院,山东济南250061

出　　处：《功能材料》2010年第6期1019-1022,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50902088);国家重点基础研究发展计划(973计划)资助项目(2006CB605314);中国博士后科学基金面上资助项目(20080431207)

摘　　要：在恒温和梯度升温两种模式下,对不同纤度、横截面形状的3种聚丙烯腈原丝进行了预氧化处理,采用扫描电镜、光学显微镜、元素分析等技术研究了预氧丝的皮芯结构及氧元素的扩散。结果表明,对于恒温模式,在250℃加热1h的预氧丝已经产生了明显的皮芯结构,而对于梯度升温模式,直到275℃才开始出现皮芯结构;原丝的横截面形状不影响氧的扩散,在相同加热条件下,肾形截面预氧丝的皮层厚度与圆形截面的相同;原丝纤度越小,越容易获得均质的预氧丝。原丝的细旦化以及适当的梯度升温预氧化工艺是获得优质预氧丝的重要保证。Three polyacrylonitrile fibers of different titre and different cross-section shape were preoxidized under two kinds of heating modes-isothermal and step-wise rising.Scanning electron microscope,optical microscope and elemental analysis technologies were used to investigate the skin-core structure and diffusion of oxygen.The results show that as for isothermal heating mode,the peroxidized fibers exhibit obvious skin-core structure at 250℃ for 1h;but as for step-wise rising mode,the skin-core structure didn＇t appear until the temperature is higher than 275℃.The diffusion of oxygen is not affected by the cross-section shape of precursor fibers.Under the same conditions,the skin thickness of round shape fibers is equal to that of kidney-like shape fibers.The thinner precursor fibers are liable to obtain uniform prestabilized fibers.Therefore,fining of precursor fibers and proper process of step-wise rising temperature are the essential guarantee for high quality proxidized fibers.

关 键 词：聚丙烯腈 碳纤维 原丝 预氧丝 皮芯结构 

分 类 号：TQ342.3[化学工程—化纤工业] TQ342.74