Akademik Veri Yönetim Sistemi
The ICASEM 4th International Applied Sciences, Engineering and Mathematics Congress, Tekirdağ, Türkiye, 20 - 23 Ekim 2022, ss.107
Three-dimensional (3D) printers are an additive manufacturing technology permitting the creation of three-dimensional items by layering materials and stacking them without using molds. Photochemical 3D printers use UV-light to polymerize photo-crosslinkable resin, to fabricate well-detailed objects without using molds. Photosensitive resin are used as the starting material in photochemical 3D printers. These resin contain monomers, oligomers, photoinitiators, preferably nanoparticles and color pigments. With the addition of TiO2 nanoparticles, nanocomposite resin may have high conversion degree and mechanical properties after polymerization. However, the tendency of TiO2 nanoparticles to agglomerate is high, but this behavior can be prevented by the silanization process. In this study, the effects of silanized and not-silanized TiO2 nanoparticles at different amounts (0.5%, 1%, 1.5%, 2% and 5% by weight), which are used as reinforcement materials in epoxy resin, on the mechanical properties and conversion degrees of 3D printed parts were investigated and compared. TiO2 nanoparticles were synthesized using the sol-gel method and silanized. Then mixed with epoxy photosensitive resin and printed. Prepared nanoparticles, resin and polymers were characterized using FT-IR, XRD, XPS, SEM, PSD, tensile and three-point bending tests. The results showed that the highest conversion degree was in the sample containing 1% additive about 79.97%, and the highest increase with silanization in the conversion degree was in the sample containing 2% additive about 53.98%. But flexural, yield and tensile strength was affected negatively after silanization. Flexural strength increased after silanization only with the sample contains 0.5% additive about 11%. Yield and tensile strength increased only with the samples contain 0.5% and 1.5% additive with the rate of 5% and 7%, respectively. But other samples showed decrease in flexural, yield and tensile strength with the rate of 15%, 13% and 14%, respectively. It has been determined that the effect of silanization process on the conversion degree is quite positive. However, it has been investigated that the same situation is not valid for mechanical properties.