Structure and property relations between the polyacrylonitrile‐based prestabilized fibers and the partially carbonized fibers
Structure and property relations between the polyacrylonitrile‐based prestabilized fibers and the partially carbonized fibers
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DOI：
10.1002/app.33810
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发表时间：
2011-12
影响因子：
3
通讯作者：
Meijie Yu;Yong Xu;Chengguo Wang;B. Zhu;Yan-xiang Wang;Xiuying Hu;Xue Lin
中科院分区：
文献类型：
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作者：
Meijie Yu;Yong Xu;Chengguo Wang;B. Zhu;Yan-xiang Wang;Xiuying Hu;Xue Lin
采用傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）研究了在空气和氮气中制备的聚丙烯腈基预稳定纤维和部分碳化纤维的结构，通过差示扫描量热法（DSC）和热重分析（TGA）测量了热性能，并对其力学性能和腐蚀性能进行了研究。 还测试了耐浓硫酸的能力。在空气中预稳定的纤维中形成氧官能团，为脱氢和分子间交联反应提供活性位点，这有利于部分碳化纤维中乱层石墨结构的形成。氮气预稳定纤维及其相应的部分碳化纤维具有脆性特征，拉伸强度和伸长率较低。空气中预稳定的纤维在浓硫酸中浸蚀6h才变色；相比之下，在氮气中预稳定的纤维仅在 1 分钟内就溶解了。这表明前者比后者具有更好的化学稳定性。目前的工作提供了直接证据，表明预稳定纤维中的含氧结构是获得高性能碳纤维的重要先决条件。 © 2011 Wiley periodicals, Inc. J Appl Polym Sci，2011
The structure of polyacrylonitrile-based prestabilized fibers and partially carbonized fibers prepared in air and nitrogen were studied by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD), the thermal properties were measured by differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA), and the mechanical properties and corrosion properties resistant to concentrated sulfuric acid are also tested. Oxygen functional groups form in the fibers prestabilized in air, providing active sites for dehydrogenation and intermolecular crosslinked reactions, which facilitates the formation of turbostratic graphite structure in partially carbonized fibers. The fibers prestabilized in nitrogen and their corresponding partially carbonized fibers are brittle feature, and have comparatively low tensile strength and elongation. The fibers prestabilized in air did not change the color of concentrated sulfuric acid until being etched in it for 6 h; by contrast, the fibers prestabilized in nitrogen were dissolved out only within 1 min. It indicates that the former has better chemical stability than the latter. The present work provides direct evidence that oxygen containing structure in prestabilized fibers is an essential precondition for obtaining high property carbon fibers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011