کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5364569 | 1503702 | 2012 | 8 صفحه PDF | دانلود رایگان |
Carbon fibers made of textile and aerospace grade polyacrylonitrile precursor fibers were surface treated by a continuous gas phase thermochemical treatment. The surface chemistry generated by the surface treatment was characterized by X-ray photoelectron spectroscopy. The surface and the average entire microstructure of the fibers were characterized by Raman spectroscopy and X-ray diffraction, respectively. Depending on the grade of the precursor, the final surface concentration of oxygen was comprised between 14% and 24%, whereas the typical commercial electrochemical surface treatments led to concentrations of around 8% with the same fibers. The final concentration of oxygen was directly correlated to the size of the crystallites which was a function of the grade of the polyacrylonitrile precursor and to the corresponding surface microstructure. The thermochemical surface treatment enabled a better control of the nature of the oxygen-containing functionalities as well. Whatever the grade of the precursor, desired hydroxyl groups and carboxylic acid functionalities were preferably generated, which is observed to be difficult with electrochemical surface treatments.
⺠Continuous thermo-chemical surface treatment used to functionalize different types of carbon fibers. ⺠Surface density of functional groups directly correlated to the size of the surface microstructure. ⺠Preferential creation of hydroxyls and carboxylic acids confirmed regardless of the type of carbon fiber. ⺠Effective surface treatment regardless of the fiber surface microstructure. ⺠Potential alternative to electro-chemical surface treatment.
Journal: Applied Surface Science - Volume 261, 15 November 2012, Pages 473-480