改性SiO_2微球增强树脂基齿科复合材料机械、热稳定性能  

Modified silica microspheres reinforced the mechanical and thermostability performances of dental resin-based composite

作　　者：王丹[1] 高延敏[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《功能材料》2015年第5期5033-5038,共6页Journal of Functional Materials

摘　　要：SiO2微球是齿科树脂的重要填充物,为进一步研究其对齿科树脂性能的影响,采用溶胶-凝胶法制备纳米SiO2微球,并将其改性后应用于齿科树脂中,通过FT-IR、SEM、TEM、激光粒度分析仪、微机控制万能拉伸试验机、DMA等对制备的SiO2及其齿科复合材料进行表征分析。结果表明,γ-甲基丙烯酰氧基丙基三甲氧基硅烷成功改性SiO2,得到的SiO2微球分散性较好,呈规则的球形,平均粒径为450nm;复合材料的强度与填充量有关,随着SiO2含量的增多力学性能增大,当填充量为45%时,复合材料的力学性能最大,弯曲强度为123.682 MPa,压缩强度为208.802MPa,E′和tanδ均达到最大值,并分析了力学性能存在差异的原因。Silica microspheres,as an important kind of fillers,have great impact on mechanical and thermal properties of dental resin.In this article,silica microspheres were prepared by sol-gel method and applied in modification of dental resin.The appearance and size of SiO2 microspheres were characterized by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM),transmission electron microscope(TEM),dynamic light scattering(DLS).It showed that SiO2 particles were successfully modified by KH-570 and had global microspheres with homogenous size and distribution(average diameter 450nm).The mechanical and thermal performances of dental composite were tested by universal testing machine and dynamic thermomechanical analysis(DMA).It found that the roughness,glass transition temperature Tgand the storage modulus E′increased with increasing of silica content,but the strength and compression strength first increased and then decreased.By optimizing the content of silica,the ratio of silica was approach 45wt%,the value of bending and compression strength reached maximum(123.682 and 208.802 MPa respectively).The effect of silica microspheres on the mechanical performance and thermostability was discussed and its possible reasons were analyzed.

关 键 词：溶胶G凝胶法 SIO2微球 齿科复合材料 性能 

分 类 号：R783.1[医药卫生—口腔医学]