The objective of this work is to improve the interlaminar shear strength and tribological properties of the high-density polyethylene (HDPE) composites by oxidation treatment method of carbon fiber (CF) and ultraviolet irradiation of HDPE. The morphologies of untreated and treated CFs were characterized by x-ray photoelectron spectroscopy. Surface analysis showed that after treatment, the surface of CFs chemisorbed oxygen-containing groups, active carbon atom, the surface roughness, and wetting ability were increased. The results show that the treated CF composites can possess excellent interfacial properties and tribological properties accordingly after treatment.
The mechanical behaviour of fluorosilicone rubber-filled PI composites with and without clay was investigated. The clay filled fluorosilicone rubber composite had the highest interlaminar shear strength value of all the combinations because its higher bond strength may have hindered a large fibre/matrix debonding. The maximum tensile strength was observed for 20 vol% fluorosilicone rubber/PI/5vol%clay composite. The interlaminar shear strength of clay filled fluorosilicone rubber/PI composite was greater than that of fluorosilicone rubber/PI composite, which shows that the adhesion factor of the combination of the PI and fluorosilicone rubber was greater.
PA6 composites with various contents of wood fibers were prepared. The effects of fiber content and ionic liquid surface treatment on the tribological behavior of PA6 composite were studied under different nominal pressures ranging from 50 to 300 N. The tribological mechanisms were discussed based on scanning electron microscopy inspections of the worn surfaces. The surface treatment of wood fibers improves the tribological performance of the neat polymer matrix.The modification can improve O/C and N/C on the surface of wood fiber, while the increase of nitrogen and oxygen content on wood fiber surface can improve the surface polarity of wood fiber and improve the infiltration and bonding between wood fiber and PA6 resin.
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