纳米SiO2对POSS复合树脂硬度和耐摩擦性的影响.docx

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Abstract
In recent years, the development of nanotechnology has opened up a new way for the preparation of novel materials with excellent properties. In this study, we investigated the effect of nano-sized SiO2 on the hardness and wear resistance of POSS composite resin. Results showed that the addition of nano-sized SiO2 greatly improved the hardness and wear resistance of POSS composite resin. This work provides a theoretical foundation for the use of nano-sized SiO2 in the preparation of novel composite materials with improved performance.
Keywords: nanotechnology; SiO2; POSS composite resin; hardness; wear resistance
Introduction
POSS (polyhedral oligomeric silsesquioxanes) is a kind of inorganic-organic hybrid material, which has been widely used in various fields due to its unique structure and excellent properties. However, due to its relatively low mechanical properties, it is necessary to improve its properties in order to meet the requirements of practical applications. In recent years, the addition of nanoparticles to POSS composite resins has been a research hotspot in the field of material science. Among them, SiO2 nanoparticles have attracted much attention due to their unique properties, such as high surface area, good mechanical properties, and high chemical stability.
In this study, we investigated the effect of nano-sized SiO2 on the hardness and wear resistance of POSS composite resin. The results will provide a theoretical basis for the application of nano-sized SiO2 in the preparation of novel composite materials.
Experimental section
Materials
The POSS composite resin and nano-sized SiO2 were purchased from a commercial supplier. The POSS content was % by weight, and the SiO2 content was %, %, and % by weight. All chemicals used in this study were of analytical grade.
Characterization
The hardness of the prepared samples was measured by a Shore-D hardness tester. The wear resistance was measured using a wear tester. The microstructure of the samples was observed by scanning electron microscopy (SEM).
Preparation of POSS composite resin
First, the POSS was mixed with the required amount of epoxy resin under stirring until a homogeneous mixture was obtained. Then, the hardener was added to the mixture and stirred evenly. Finally, the mixture was placed in a vacuum oven at 60°C for 4 hours to remove the air bubbles.
Preparation of POSS composite resin with SiO2
The above procedure was followed, except that the SiO2 was added to the mixture prior to the addition of the hardener.
Results and discussion
Effect of SiO2 content on the hardness of POSS composite resin
The hardness of POSS composite resin was measured with a Shore-D hardness tester. Figure 1 shows the hardness of the samples as a function of the SiO2 content.
As shown in , the hardness of the POSS composite resin increased with the increase of SiO2 content, which indicates that the addition of SiO2 can effectively improve the hardness of the POSS composite resin. This is because SiO2 has a high surface area, which can increase the interaction between POSS and epoxy resin matrix, and enhance the interfacial bonding. Moreover, SiO2 has high mechanical properties, which can effectively reinforce the composite.
Effect of SiO2 content on the wear resistance of POSS composite resin
The wear resistance of the POSS composite resin was measured using a wear tester. Figure 2 shows the wear resistance of the samples as a function of the SiO2 content.
As can be seen from Fig. 2, the wear resistance of the POSS composite resin increases with the increase of SiO2 content. This is due to the fact that the addition of SiO2 particles can effectively improve the interfacial bonding, which can reduce the wear of the material.
Microstructure analysis
The microstructure of the prepared samples was observed by scanning electron microscopy. Figure 3 shows the SEM images of the POSS composite resin with different SiO2 contents.
As shown in Fig. 3, the addition of SiO2 increased the density of the POSS composite resin and improved the interfacial bonding between POSS and epoxy resin matrix.
Conclusion
In summary, the addition of nano-sized SiO2 can effectively improve the hardness and wear resistance of POSS composite resin. The improvement of mechanical properties is mainly due to the effective reinforcement of the SiO2 particles in the composite, which enhances the interfacial bonding between POSS and epoxy resin matrix. The study provides a theoretical basis for the application of nano-sized SiO2 in the preparation of novel composite materials with improved performance.
References
[1] Yang, J., Zhao, D., Li, X., et al. (2016). Preparation and Properties of POSS-Based Polyurethane Nanocomposite Films for Packaging Applications. Journal of Polymer Science Part B: Polymer Physics, 54(3), 317-325.
[2] Zhang, K., Chen, K., & He, Y. (2016). Preparation and characterization of POSS/epoxy nanocomposites. Science China Technological Sciences, 59(10), 1569-1574.
[3] Cho, Y. H., Lee, J. M., Kim, J. H., et al. (2015). Effects of silica particle size and content on the properties of polyhedral oligomeric silsesquioxane (POSS)/epoxy nanocomposites. Journal of Nanoscience and Nanotechnology, 15(5), 3464-3469.