| Light-weight and high-strength composite materials is one most important direction of modern and advanced composite materials. It is widely used in aerospace materials, deep-sea buoyancy materials, fan blade materials and other fields which need both high strength and low density. One of the most important questions is keeping or improving the strength when lowing their density. In the resin-based composites, adding hollow glass beads (HGB) is a very effective solution. HGB have low density, high strength, high dispersion, do not absorb resin, waterproof and other advantages.In the study, using the advantages of HGB composite with resin, and using HGB as a"truck"of CNTs, successfully we prepared a light weight and high strength epoxy matrix composites. Firstly we attached the carbon nanotubes (CNTs) to the surface of the hollow glass beads under certain conditions, and we got the"CNTs microspheres". In this way we solved the dispersion problem of carbon nanotubes. Secondly, the ultrasounded carbon fiber(CF) was dispersed in the"CNTs microspheres", then they were added in the epoxy resin. So the second aggregation of the carbon fiber was avoided. Thus we got one kind of epoxy composites. This epoxy composites had only 67% of the original density, and the tensile strength was enhanced more than 15%, the modulus was increased by 60% or more. So all this would have great application value.In addition by the use of the dispersion of hollow glass beads, we also studied other inorganic nanotubes to enhance the resin. Halloysite nanotubes (HNTs) was one kind of multi-walled nanotubes in nature of great pratical value. We modified the HNTs separately by polyethylene glycol (PEG) intercalation, silane coupling agent (KH550) coated and rare earth (Ce) coating. After the SEM, TG, FT-I and XRD characterization, we found that the modified HNTs can significantly improve the mechanical property of the resin with HGB in. And the original HNTs without modification could not improve so much. |
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