Torokhov Valerii G, Chukov Dilyus I, Tcherdyntsev Victor V, Sherif Galal, Zadorozhnyy Mikhail Y, Stepashkin Andrey A, Larin Ilya I, Medvedeva Elena V
Laboratory of Functional Polymer Materials, National University of Science and Technology "MISIS", Leninskii Prosp, 4, 119049 Moscow, Russia.
Center for Genetics and Life Science, Department of Biomaterials, Sirius University of Science and Technology, 354349 Sochi, Russia.
Polymers (Basel). 2022 Jul 21;14(14):2956. doi: 10.3390/polym14142956.
In this study, the mechanical and thermophysical properties of carbon fiber-reinforced polyethersulfone are investigated. To enhance the interfacial interaction between carbon fibers and the polymer matrix, the surface modification of carbon fibers by thermal oxidation is conducted. By means of AFM and X-ray spectroscopy, it is determined that surface modification changes the morphology and chemical composition of carbon fibers. It is shown that surface modification dramatically increases the mechanical properties of the composites. Thus, flexural strength and the E-modulus of the composites reinforced with modified fibers reached approximately 962 MPa and 60 GPa, respectively, compared with approximately 600 MPa and 50 GPa for the composites reinforced with the initial ones. The heat deflection temperatures of the composites reinforced with the initial and modified fibers were measured. It is shown that composites reinforced with modified fibers lose their stability at temperatures of about 211 °C, which correlates with the glass transition temperature of the PES matrix. The thermal conductivity of the composites with different fiber content is investigated in two directions: in-plane and transverse to layers of carbon fibers. The obtained composites had a relatively high realization of the thermal conductive properties of carbon fibers, up to 55-60%.
在本研究中，对碳纤维增强聚醚砜的力学和热物理性能进行了研究。为增强碳纤维与聚合物基体之间的界面相互作用，对碳纤维进行了热氧化表面改性。借助原子力显微镜（AFM）和X射线光谱法，确定表面改性改变了碳纤维的形态和化学成分。结果表明，表面改性显著提高了复合材料的力学性能。因此，用改性纤维增强的复合材料的弯曲强度和弹性模量分别达到约962MPa和60GPa，而用原始纤维增强的复合材料的弯曲强度和弹性模量分别约为600MPa和50GPa。测量了用原始纤维和改性纤维增强的复合材料的热变形温度。结果表明，用改性纤维增强的复合材料在约211°C的温度下失去稳定性，这与聚醚砜基体的玻璃化转变温度相关。研究了不同纤维含量的复合材料在两个方向上的热导率：面内方向和垂直于碳纤维层的方向。所制备的复合材料对碳纤维导热性能的实现率相对较高，高达55 - 60%。
