Analysis and Characterization of Orientation Structure of Pre-oxidized PAN Fibers in High Magnetic Fields
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2014年第2期
论文作者：任小孟 王源升 HE Te XIA Zhengcai
文章页码：224 - 228
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 properties of pre-oxidized PAN fibers.
任小孟1,2，王源升2,3，HE Te4，XIA Zhengcai5
1. Department of Ship Sanitation,Naval Medical Research Institute2. Department of Chemistry and Material,Naval University of Engineering3. State Key Laboratory of Polymer Materials Engineering of China, Sichuan University4. School of Material Science and Engineering, Nanchang Aviation University5. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
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 properties of pre-oxidized PAN fibers.
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