高性能刷状ZnO介晶的制备及其对复合树脂性能的增强作用

无机填料作为齿科复合树脂的主要成分,对其性能影响最为显著.本文以阿拉伯胶为结构导向剂,用热水解法合成了多孔、分级结构的刷状ZnO介晶,其厚度和直径分别为1.2μm和1.0μm.通过微流控制法在其表面包覆了4～6 nm无定形SiO2,以利于其表面硅烷化.通过场发射扫描电镜(FE-SEM)、X射线衍射仪(XRD)、热重分析...

Preparation of High Performance Brush-Like Zinc Oxide Mesocrystals and Its Reinforcing Effect on Properties of Resin Composites

The inorganic filler is the main component of dental resin composite, which is very important for the properties of resin composite. In this paper, ZnO mesocrystals with porous and hierarchical structure were achieved by a thermal hydrolysis method using gum arabic as structure-directing agent. The thickness and diameter of the synthesized ZnO mesocrystals were about 1.2 μm and 1.0 μm. The amorphous silica in a thickness of 4~6 nm was uniformly coated on the surface of ZnO mesocrystals via the microfluidc process. ZnO mesocrystals were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The ZnO@SiO₂ was firstly modified with 3-methacryloxypropyl trimethoxysilane (γ-MPS), and mixed with modified SiO₂ nanoparticles as co-filler. Subsequently modified inorganic particles were added into Bis-GMA/TEGDMA to prepare dental composite resin by light-curing. The mechanical testing show that the mass fraction of ZnO@SiO₂ (≤5%) could improve the mechanical properties of composite resin effectively. The silica matrix composite resin filled with 3% ZnO@SiO₂ demonstrates the best mechanical properties, among which the flexural strength, flexural modulus and compression strength increase by 12.9%, 6.6% and 3.7%, respectively, in comparison with the composite using of only SiO₂ filler. This optimal composite also exhibits superior antimicrobial activity, with antibacterial rate up to 98.7% to Streptococcus mutans. In addition, the composite resin with ZnO@SiO₂ also has better wear resistance.