X射线光电子能谱
表面改性
扫描电子显微镜
透射电子显微镜
材料科学
接触角
化学工程
超细纤维
碳纳米纤维
滴定法
聚合物
纤维
碳纳米管
纳米技术
复合材料
化学
有机化学
工程类
作者
H. Bubert,Xingtao Ai,S. Haiber,M. Heintze,Volker Brüser,E. Pasch,W. Brandl,Gabriela Mărginean
标识
DOI:10.1016/s0584-8547(02)00101-5
摘要
The background of the present investigation is to enhance the overall adherence of vapor grown carbon fibers (VGCF) to the surrounding polymer matrix in different applications by forming polar groups at their surfaces and by modifying the surface morphology. This has been done by plasma treatments using a low-pressure plasma with different gases, flow rates, pressures and powers. Two different types of carbon fibers were investigated: carbon microfibers and carbon nanofibers. The characterization of fiber surfaces was achieved by photoelectron spectroscopy (XPS), contact angle measurements and titration. These investigations were accompanied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The oxygen plasma treatment of the fibers changes the surfaces by forming a layer with a thickness of the order of one nanometer mainly consisting of functional groups like hydroxyl, carbonyl and carboxyl. After functionalization of the complete surface, a further plasma treatment does not enhance the superficial oxygen content but changes slightly the portions of the functional groups. A comparison of the methods applied provides a largely consistent image of the effect of plasma treatment.
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