| 引用本文: | 王统帅,童元建,罗莎,昌志龙,徐樑华.低温碳化过程PAN氧化纤维骨架结构转变[J].材料科学与工艺,2011,19(6):133-137.DOI:10.11951/j.issn.1005-0299.20110624. |
| .Transformation of skeleton structures in stabilized PAN fiber during low temperature carbonization[J].Materials Science and Technology,2011,19(6):133-137.DOI:10.11951/j.issn.1005-0299.20110624. |
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| 摘要: |
| 为实现PAN纤维在低温碳化过程的结构调控,利用核磁共振碳谱(13C-NMR)研究了PAN预氧化纤维在500～800℃的低温碳化过程中骨架结构的演变.结果表明:在低温碳化过程中,随着碳化温度的升高,预氧化纤维骨架结构中饱和的CH、CH2和C O结构逐渐消失,共轭—HC C<和>C N—逐渐减小,共轭>C C<逐渐增加,纤维形成多层多环芳香结构;多环芳香结构平均层数与碳化温度密切相关,经500、600、700、800℃碳化处理后,纤维骨架结构中多环芳香结构平均层数分别达到1.29、2.17、2.81和3.42;在较低碳化温度(500℃),多环芳香结构平均层数随碳化处理时间延长增加不明显,在较高碳化温度(700℃),多环芳香结构平均层数随碳化处理时间呈线性增加. |
| 关键词: 聚丙烯腈基碳纤维 固体核磁碳谱 骨架结构 多环芳香结构 |
| DOI：10.11951/j.issn.1005-0299.20110624 |
| 分类号:TQ342.3 |
| 基金项目:国家重点基础研究发展计划资助项目(2011CB605601,2011CB605602) |
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| Transformation of skeleton structures in stabilized PAN fiber during low temperature carbonization |
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1.State Key Laboratory of Organic-Inorganic composites,Beijing University of Chemical Technology,Beijing 100029, China;2.Key Laboratory of Carbon Fiber and Functional Polymer,Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China
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| Abstract: |
| To better understand the mechanisms of low temperature carbonization,the evolution of skeleton structures for stabilized polyacrylonitrile(PAN) fiber during carbonization at 500～800℃ was investigated by 13C-NMR(Nuclear Magnetic Resonance).The results showed that the saturated CH,CH2 and—C-O—groups disappeared in the stabilized fiber after carbonization.With the increasing of temperature,the conjugated—HC-C< and>C-N—groups decreased,while the conjugated>C-C< groups increased in the skeleton structures of the fiber.The number of layers of polycyclic aromatic structure in the fibers reached to 1.29,2.17,2.81 and 3.42 after carbonized at 500,600,700 and 800 ℃,respectively.There was no significant increase of the number of layers at 500 ℃,while linear increase of layers with time was found at 700 ℃. |
| Key words: polyacrylonitrile based carbon fiber solid state nuclear magnetic resonance skeleton structure polycyclic aromatic structure |
