聚丙烯腈原丝聚集态结构的长周期特征  

Long Period Aggregation Structure of Polyacrylonitrile Precursor Characterized by Smal-l Angle X-Ray Scattering

作　　者：肖瑛阁[1] 徐木梁华[1] 武帅[1] 袁俊崧[1] 曹维宇[1] 

机构地区：[1]北京化工大学有机无机复合材料国家重点实验室,炭纤维及功能高分子教育部重点实验室,北京100029

出　　处：《高分子材料科学与工程》2013年第6期88-91,共4页Polymer Materials Science & Engineering

基　　金：973计划项目(2011CB605603)

摘　　要：采用小角X射线散射方法,通过模型计算将散射信号中聚丙烯腈(PAN)原丝长周期结构与微孔结构信息有效分离,建立了用小角X射线散射(SAXS)研究PAN纤维聚集态结构长周期特征结构的方法。通过对原丝湿法成型过程中的长周期特征结构演变的研究发现,PAN制备过程中凝固阶段纤维形成两相准晶体系,晶区和非晶区交替排列形成长周期结构,通过相关函数分析获得了PAN中准晶区、非晶区以及两相过渡层的统计尺寸信息,并结合广角X射线衍射数据讨论了凝固相分离过程和牵伸外场因素对长周期结构的影响。Small angle X-ray scattering （SAXS） was used to investigate the high order structure of polyacrylonitrile （PAN） precursor during the wet spinning process. The scattering signal that came from the micro-void and long period structure was separated successfully by the analog computation method of deconvolution of the two dimensional SAXS pattern. The results indicate that during the coagulation of PAN precursor, the periodical high order structure is composed of crystalline and amorphous phase, which arrange alternately with pseudo-crystalline layer along the fiber axis. The long period of the coagulated fiber is cald. 47.6nm. Statistics size of crystalline region, amorphous region and transition zone were obtained by the analysis of correlation function. By combining WAXD data, the evolution of the long period during the coagulation and the effect of the stretching were also discussed. During the processing of coagulation, the long period decreases. After stretching, the long periodical high order structure disappears due to the formation of homogenous quasicrystalline structure.

关 键 词：聚丙烯腈原丝 小角X射线散射 微孔结构 长周期 

分 类 号：TQ342.31[化学工程—化纤工业]