Analysis and Characterization of Orientation Structure of Pre-oxidized PAN Fibers in High Magnetic Fields  

作　　者：任小孟 王源升 HE Te XIA Zhengcai 

机构地区：[1]Department of Ship Sanitation,Naval Medical Research Institute [2]Department of Chemistry and Material,Naval University of Engineering [3]State Key Laboratory of Polymer Materials Engineering of China, Sichuan University [4]School of Material Science and Engineering, Nanchang Aviation University [5]Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第2期224-228,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(51073098);the Open Project of State Key Laboratory of Polymer Materials Engineering(Sichuan University),China(KF200901)

摘　　要：PAN fibers pre-oxidized at 240℃, 260℃, 280℃, 300℃ were treated in 8 T, 12 T, 16 T high magnetic fields, respectively. The experimental result implied that there were two kinds of magnetic units cyan and carbon-nitrogen heterocycle in pre-oxidized PAN fibers, and the movement of magnetic units resulted in changes of orientation structure of pre-oxidized PAN fibers in high magnetic fields. Overall orientation increased with increase of magnetic field intensity and extension of processing time, whereas change of crystalline orientation depended on magnetic field intensity and content of carbon-nitrogen heterocycle due to the competition of two magnetic units. Furthermore, magnetic fields induced the conversion from amorphous region to crystal region and improved crystalline orooerties of ore-oxidized PAN fibers.PAN fibers pre-oxidized at 240℃, 260℃, 280℃, 300℃ were treated in 8 T, 12 T, 16 T high magnetic fields, respectively. The experimental result implied that there were two kinds of magnetic units cyan and carbon-nitrogen heterocycle in pre-oxidized PAN fibers, and the movement of magnetic units resulted in changes of orientation structure of pre-oxidized PAN fibers in high magnetic fields. Overall orientation increased with increase of magnetic field intensity and extension of processing time, whereas change of crystalline orientation depended on magnetic field intensity and content of carbon-nitrogen heterocycle due to the competition of two magnetic units. Furthermore, magnetic fields induced the conversion from amorphous region to crystal region and improved crystalline orooerties of ore-oxidized PAN fibers.

关 键 词：pre-oxidized PAN magnetic field ORIENTATION 

分 类 号：TQ342.31[化学工程—化纤工业]