纳米SiO_2对笼形低聚硅倍半氧烷复合树脂硬度和耐摩擦性的影响

Nano-Si_O2's effect on Polyhedral Oligomeric Silsesquioxane composite resin's hardness and abrasion resistance

目的测定加入不同比例纳米SiO2后,笼形低聚硅倍半氧烷(polyhedral oligomeric silsesquioxane,POSS)复合树脂的硬度和耐摩擦性,探索纳米SiO2含量的最佳比例。方法将硅烷偶联剂KH-550表面改性的纳米SiO2加入POSS复合树脂中,置入标准摸具内光固化60s,完成试件制作。根据SiO2占POSS复合树脂质量分数不同,将实验组分为0.5%组、1%组、1.5%组、2%组,不加SiO2的POSS复合树脂设为空白对照组,测定每组复合树脂在相同最大载荷下的硬度及划痕深度。结果统计学分析结果表明,1%组和1.5%组复合树脂的硬度显著增加(P<0.05),1.5%组增加更为明显。1.5%组复合树脂的划痕深度显著减小(P<0.05),即耐摩擦性显著增强。结论添加适当比例的纳米SiO2可以提高POSS复合树脂的机械性能。

Objective To measure the POSS composite resin＇s hardness and abrasion resistance after adding different proportions of nano-SiO2, and explore the best proportion of SiO2 content. Methods Add silane coupling agent KH-550 surface-modified nano-SiO2 into POSS composite resin, and place into the standard mold for light-curing for 60 s so as to complete specimen production. Based on the SiO2 mass friction of the POSS composite resin, divide the experimental group into Group 0.5%, Group 1%, Group 1.5% and Group 2% and set the POSS composite resin without SiO2 as the control group. Measure the hardness and the depth of the scratch of the POSS composite resin in each group under the same maximum load. Results Statistical analysis shows that the composite resin hardness in the 1% group and1.5% group increases significantly（P〈0.05）, the 1.5% group increases even more significantly, and the scratch depth of the 1.5% composite resin group（P〈0.05） evidently decreases, i.e., abrasion is significantly enhanced. Conclusion With the appropriate proportion of nano-SiO2, the mechanical properties of the POSS composite resin can be increased.