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目的：观察纳米SiO2填料对纳米复合树脂poss 的弯曲强度和抗压强度的影响，探究纳米SiO2的最佳添加比。方法：将经过硅烷偶联化的纳米SiO2颗粒加入poss 复合树脂中，合成SiO2质量分数分别为0.5%，1%，1.5%和2%的SiO2/poss 复合树脂，分别为BCDE 四组，纯poss组为A 组（对照组）。每组试件固定于万能材料测试机上，以1.0mm/min 的速度垂直加压直至试样破坏，采用SPSS16.0 软件对结果做单因素方差分析。结果：弯曲强度测试结果：C 组最高，与其他四组均有统计学差异（P<0.05）；A、B、D 三组无显著性差异，与E 组差异明显（P<0.05）。抗压强度测试结果：D 组最高，与其他四组均有统计学差异（P<0.05）；B 组和E 组与A 组差异显著（P<0.05），与C 组无显著差异。结论：纳米SiO2在一定范围内能够提高poss复合树脂的弯曲强度和抗压强度。

英文摘要:

Objective:To observe the effects of nano-silica upon flexural strength and compressive strength of poss composite resin.Methods:After measured 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt% by the electronic balance, nano SiO2 particles were added into poss composite resin respectively. Flexural strength and compressive strength of each material were determined by Zwick/Z010 universal testing machine, which were pressed by 1 mm／min until fracture occurred. The data were analyzed by ANOVA with the use of SPSS16. 0 software.Results:The data of flexural strength revealed that Group C exhibited higher flexural strength than the other four groups. There was no statistical difference among Group A, B and D, but important diferences could be seen between Group E and any of the above three groups. Result of compressive strength testing: The compressive strength of Group D is the highest. There was statistical difference between Group A and Group B, the same difference could be seen between group A and Group E. There was no significant difference among Group B, C and E.Conclusion:Approriate proportion of nano-silica could enhance the flexural strength and compressive strength of poss composite resin.

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