| Nano/polymer composite materials have been developed in recent years, which display distinct mechanical, physical and chemical properties. In the process to fabricate the high performance composites, the homogeneous filler dispersion has a great importance. Dispersion of the nano SiO2 particles in the liquid medium has been studied and the disperse status has been characterized in this paper. The results show that selecting the coupling agent KH570 and using the method of 10min-ultrasonical dispersing and 4hour-ball milling, the preferable aqueous SiO2 suspension can be obtained. The mechanism of dispersing nano Al2O3 aqueous suspension has been investigated. The highly dispersed and stabilized nano- Al2O3 aqueous suspensions can be obtained at acid condition (pH=3) with the PEG400 and tri-ammonium citrate (TAC) as dispersants from the steric stabilization and electrostatic mechanism respectively. Nano SiO2 or nano Al2O3 powder is filled in the polyetheretherketone (PEEK) matrix by co-mixing methods of the ultrasonical dispersing and ball milling respectively. The composite powders are molded by moulding and injection moulding into tailor products. It is revealed by the SEM morphology and the mechanical test results of SiO2/PEEK composite that the fillers can be dispersed in the PEEK matrix homogeneously at nano scale by the method above, and the higher strengths in tension and bending are also achieved in comparison with the unfilled PEEK. When the content of nano SiO2 is 7%, the properties can be increased by 13%(tensile strength) and 32%(bending strength) respectively. Which is due to the formation of much more dimple morphology than the matrix under the stress.This research project is of significance for exploring new way in the development of polymer matrix based composite materials that are more and more important for the structured components due to their excellent properties. |
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