两种偶联剂改性纳米二氧化硅可影响树脂基托的力学性能

摘要

背景:聚甲基丙烯酸甲酯基托材料因其良好的生物相容性,色泽好,易于加工成型等优点被广泛使用,但因其韧性、硬度问题也存在容易折裂的不足.目的:对比两种偶联剂改性的纳米SiO2颗粒对聚甲基丙烯酸甲酯材料的弯曲强度、弯曲弹性模量和硬度改变.方法:将两种偶联剂KH-570 和KH-502 改性的纳米SiO2颗粒按质量比3%加入聚甲基丙烯酸甲酯粉体中制成(SiO2/聚甲基丙烯酸甲酯)纳米复合材料.实验分为聚甲基丙烯酸甲酯材料、纳米SiO2/聚甲基丙烯酸甲酯复合材料、KH-570-SiO2/聚甲基丙烯酸甲酯复合材料、KH-502-SiO2/聚甲基丙烯酸甲酯复合材料4 组.结果与结论:未经过偶联剂改性的纳米SiO2/聚甲基丙烯酸甲酯复合材料与聚甲基丙烯酸甲酯材料相比,其弯曲强度、弯曲弹性模量和硬度差异无显著性意义(P>0.05),而经过偶联剂改性的纳米SiO2/聚甲基丙烯酸甲酯复合材料与聚甲基丙烯酸甲酯材料之间比较,其弯曲强度、弯曲弹性模量显著增强(P<0.05),KH-502-SIO2/PMMA组弯曲强度、弯曲弹性模量和硬度值显著大于与其他3 组(P<0.05).结果表明,把经过偶联剂改性的纳米SiO2颗粒添加到聚甲基丙烯酸甲酯材料中制成SiO2聚甲基丙烯酸甲酯复合材料,可使材料的弯曲强度、弯曲弹性模量和硬度明显提高.而经过偶联剂KH-502 改性的纳米SiO2聚甲基丙烯酸甲酯复合材料性能提高更为显著.%BACKGROUND: Polymethyl methacryl (PMMA) is widely used based on its good biocompatibility, good color and ease of molding. However, this material is easy to be fractured because of its poor toughness and hardness.OBJECTIVE: To study the changes of bending strength, flexural modulus and hardness of PMMA materials induced by modified nano-SiO2 particles which are modified with two kinds of coupling agents.METHODS: SiO2/PMMA nanocomposites were prepared with 3% nano-SiO2 particles modified by two kinds of coupling agents (KH-570 and KH-502) and PMMA powders. There were four groups, PMMA group, SiO2/PMMA group, KH-570-SiO2/PMMA group and KH-502-SiO2/PMMA group.RESULTS AND CONCLUSION: The bending strength, flexural modulus and harnesses of the SiO2/PMMA group and the PMMA group had no significant difference (P > 0.05), while the bending strength, flexural modulus and hardness of modified-SiO2/PMMA were obviously increased compared with PMMA group (P < 0.05). The KH-502-SiO2/PMMA had the best bending strength, flexural modulus and harnesses among these groups (P < 0.05). It is indicated that the SiO2/PMMA nanocomposites prepared by adding modified-SiO2 particles into PMMA have better bending strength, flexural modulus and harnesses. Performance improvement is more obvious in KH-502-SiO2/PMMA.