化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (9) : 95-97.

新材料与新技术

预氧结构对PAN纤维热裂解行为的影响

徐盼盼, 李常清, 张校, 贾龙飞, 任瑞, 徐樑华

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Influence of pre-oxidized structure on thermal cracking of PAN fiber

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Received
2017-05-08
Issue Date	Revised Date
2018-11-05	2017-05-08

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摘要

通过采用固体 ¹³C核磁谱图(¹³C-NMR)、元素分析(EA)、热失重-红外联用(TG-IR)和拉曼光谱分析仪(Raman)等研究了热处理聚丙烯腈(PAN)纤维的结构演变及其热裂解行为。结果表明,随着预氧化温度的升高,环化结构与含氧结构相对含量的比值先升高后降低。过多的含氧结构在后续热裂解过程中携带碳原子脱除,降低了预氧纤维的热稳定性和最终碳纤维的有序度。在充分环化的基础上,环化结构与含氧结构比值为10.39时,PAN预氧纤维热稳定性最佳。

Abstract

The chemical structure evolution and their influence on thermal cracking of PAN pre-oxidized fibers were investigated through using solid-state ¹³C nuclear magnetic resonance spectra(¹³C-NMR),elemental analysis (EA),thermo gravimetric-infrared spectroscopy (TG-IR) and Raman spectroscopy(Raman).The result showed that the ratio of cyclic structure against oxygen-bearing structure increased at first and decreased subsequently.Too much oxygen-bearing structure be removed during subsequent carbonization,thus this had negative impact on thermal stability and order degree of PAN-based carbon fibers.Besides,on the basis of fully cyclization,pre-oxidized fibers had best thermal stable when the ratio of cyclic structures against oxidized structures was 10.39.

关键词

聚丙烯腈纤维 / 预氧结构 / 相对含量 / 热裂解

Key words

PAN fiber / pre-oxidized structure / relative content / thermal cracking

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徐盼盼, 李常清, 张校, 贾龙飞, 任瑞, 徐樑华. 预氧结构对PAN纤维热裂解行为的影响[J]. 化工新型材料, 2018, 46(9): 95-97 DOI:

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