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首页> 外文期刊>Journal of Applied Polymer Science >Evaluating multi-step oxidative stabilization behavior of coal tar pitch-based fiber
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Evaluating multi-step oxidative stabilization behavior of coal tar pitch-based fiber

机译：评估煤焦油沥青纤维的多步氧化稳定行为

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摘要

Oxidative stabilization is an important step for isotropic pitch-based carbon fiber preparation; coal tar pitch-based fiber is treated by multi-step oxidative stabilization under various conditions to investigate the oxidative stabilization mechanism. The chemical structure changes of isotropic pitch-based fiber during the oxidative stabilization and carbonization stage are systematically characterized by In-situ diffuse reflectance infrared Fourier transform, elemental analysis, mass spectroscopy, X-ray photoelectron spectroscopy, nuclear magnetic resonance, scanning electron microscope with an energy dispersive X-ray spectrometer. These results show that the oxygen distribution gradient in oxidative stabilized fiber radial direction become homogeneously with the increasing of oxidation temperature and time under multi-step oxidative stabilization. The resultant carbon fiber shows tensile strength of 942 +/- 42 MPa and Young's modulus of 42.8 +/- 3.1 GPa due to appropriate oxygen content, homogeneous oxygen distribution, more cross-link bond (C-O-C) content, higher aromaticity and lower weight loss introduced in multi-step oxidative stabilized pitch fiber. The multi-step oxidative stabilization provides synergy effect between reaction rate and the oxygen diffusion rate as well as eliminates the oxygen concentration gradient, it provides an time-saving and energy-effective method for the oxidative stabilization of isotropic pitch-based carbon material (pitch fiber, pitch microsphere, etc.) and improve the resultant carbon material performance.
机译：氧化稳定是制备各向同性沥青基碳纤维的重要步骤；对煤沥青基纤维在不同条件下进行多步氧化稳定化处理，探讨其氧化稳定机理。采用原位漫反射红外傅里叶变换、元素分析、质谱、X射线光电子能谱、核磁共振、扫描电子显微镜和能量色散X射线光谱仪系统地表征了各向同性沥青基纤维在氧化稳定和碳化阶段的化学结构变化。结果表明，在多级氧化稳定条件下，随着氧化温度的升高和氧化时间的延长，氧化稳定纤维径向的氧分布梯度趋于均匀。合成的碳纤维具有942+/-42 MPa的抗拉强度和42.8+/-3.1 GPa的杨氏模量，这是因为在多级氧化稳定沥青纤维中引入了适当的氧含量、均匀的氧分布、更多的交联键（C-O-C）含量、更高的芳香性和更低的重量损失。多步氧化稳定提供了反应速率和氧扩散速率之间的协同效应，消除了氧浓度梯度，为各向同性沥青基碳材料（沥青纤维、沥青微球等）的氧化稳定提供了一种省时、节能的方法，并改善了合成碳材料的性能。

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