Kruppke Iris, Scheffler Christina, Simon Frank, Hund Rolf-Dieter, Cherif Chokri
Institute of Textile Machinery and High-Performance Material Technology, Technische Universität Dresden, Hohe Straße 6, 01069 Dresden, Germany.
Leibniz-Institut für Polymerforschung Dresden e. V. (IPF), Hohe Straße 6, 01069 Dresden, Germany.
Materials (Basel). 2019 Feb 14;12(4):565. doi: 10.3390/ma12040565.
In this paper, the oxy-fluorination process and the influence of different concentrations of fluorine and oxygen in the gas phase on the physicochemical properties of polyacrylonitrile(PAN)-based carbon fibers are described. The properties of the treated carbon structures are determined by zeta potential and tensiometry measurements. In addition, changes in surface composition and morphology are investigated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Adhesion properties are characterized by the single fiber pull-out (SFPO) test. Furthermore, changes in intrinsic properties are described by means of tensile and density measurements. After a primary desizing effect by oxy-fluorination, an increased number of oxygen-containing surface functional groups could be detected, which led to more debonding work in SFPOs with an epoxy-based matrix. It was also shown that the polar surface energy grows with rising fluorine concentration in the reaction gas mixture. In addition, a minor increase of ~10% in the maximum strength of PAN-based carbon fibers is detected by single fiber tensile measurements after oxy-fluorination with a fluorine content of 5% in the reaction mixture.
本文描述了氧氟化过程以及气相中不同浓度的氟和氧对聚丙烯腈（PAN）基碳纤维物理化学性质的影响。通过zeta电位和张力测量来确定处理后碳结构的性质。此外，利用X射线光电子能谱（XPS）和扫描电子显微镜（SEM）研究表面组成和形态的变化。通过单纤维拔出（SFPO）试验来表征粘附性能。此外，通过拉伸和密度测量来描述固有性质的变化。经过氧氟化的初步退浆作用后，可以检测到含氧化合物表面官能团的数量增加，这导致与环氧基基体的SFPO中有更多的脱粘功。还表明，极性表面能随着反应气体混合物中氟浓度的增加而增加。此外，在用含5%氟的反应混合物进行氧氟化后，通过单纤维拉伸测量发现PAN基碳纤维的最大强度略有增加，约为10%。
