纳米金刚石改性核树脂的机械及固化性能

Research of changes in the mechanical properties and curability of composite core materials modified with ultrafine diamond

目的以纳米金刚石(UFD)为填料加入到自行合成的光固化核树脂中,测试核树脂的性能变化。方法将不同含量的钡玻璃粉填料和UFD加入到树脂基质中制得6组光固化核树脂,分别测试它们的挠曲强度、维氏显微硬度和光固化深度,使用单因素方差分析法对挠曲强度、维氏显微硬度值的测量结果进行统计学分析。结果仅加质量分数为0.2%硅烷化处理的UFD即可使钡玻璃含量分别为60%和70%的两种光固化核树脂的挠曲强度分别提高34%和21%,而维氏显微硬度分别增加23%和30%;同时核树脂的固化深度均超过2 mm,符合相应的国际标准要求。但是UFD会对核树脂的颜色产生一定影响。结论微量UFD的加入能显著改善树脂的机械性能,同时又不影响材料的固化性能,但是对树脂颜色的影响需进一步改善。

Objective As a new kind of reinforcing filler,ultrafine diamond（UFD） is added into photocurable composite core materials.The properties of the materials are then measured to see if there is any improvement.Methods Different content of barium glass and UFD were added into resin matrix to fabricate six groups of photocurable composite core materials.For each group of the materials,the flexural strength,Vicker′s micro-hardness and depth of cure were measured.Data of the flexural strength and Vicker′s micro-hardness was then collected and analyzed by One-Way ANOVA.Results For the two kinds of composites with barium glass of 60% and 70%,only a small quantity of modified UFD with 0.2% weight percentage could improve the flexural strength of the composites by 34% and 21% respectively,the microhardness was improved by 23% and 30% respectively.The depth of cure of the composite core materials were more than 2 mm,which had reached the demand of the corresponding ISO criteria.The addition of UFD could make the composite core materials darker and grayer.Conclusion Micro-quantity of UFD can improve the mechanical properties of composite resins notably,and it will not affect the curability of the materials,but the defect in the color need to be reformed.