熔附条件对牙科复合树脂中SP1 SiO_2表面结构及形态的影响

The influence of fusing conditions on the surface structure and morphology of SP1 SiO_2 in dental resin composites

目的:研究熔附温度和熔附时间对多微孔纳米二氧化硅粒子(SP1 SiO2)表面结构及形态的影响。方法:将SP1SiO2以250℃/h的升温速度分别升至500、650、800、950、1100℃,并分别保持10、30min和3h制作试样,进行表面结构及形态测试。结果:随烧结温度的增高和时间的延长,SP1 SiO2颗粒表面的Si-OH键特征峰值逐渐减弱,条件为950℃、10min和30min,650℃、3h时完全消失;随着熔附温度的升高和熔附时间的延长颗粒增大、粒度分布变窄。结论:熔附温度和熔附时间影响SP1 SiO2颗粒表面的Si-OH含量和颗粒大小、粒度分布。

Objective： To evaluate the influence of fusing conditions on the surface structure and morphology of the SP1 SiO2. Methods：The SP1 SiO2 samples were sintered under 500,650, 800,950 and 1 100 ℃ at a rate of 250 ℃/h and maintained for 10, 30 min, 3 h respectively. The surface structure was characterized by FT-IR. Results：The characteristic peak of Si-OH bond at 958 cm^-1 took off gradually with the rising temperature and prolonged time. Under the conditions of 950 ℃ maintained for 10 rain and 30 rain, and 650 ℃ maintained for 3 h, it disappeared completely. The particles of the SP1 SiO2 became larger while the size distribution became narrow. Conclusion： Fusing conditions can affect the Si-OH content and the size of the SP1 SiO2, as well as the size of distribution.