SiO2表面接枝PMMA对齿科材料性能改进的研究

目的通过硅烷偶联剂KH-570处理SiO2纳米粒子,向其表面引入双键使其功能化,采用乳液聚合的方法在SiO2纳米粒子表面进行接枝聚合,实现高分子对SiO2纳米粒子的表面包覆处理,制得PMMA-KH-570-SiO2纳米复合材料,采用FTIR对SiO2纳米粒子表面结构进行了表征研究,并且测定了它的多种机械性能,与表面处理过的SiO2纳米粒子直接分散至PMMA乳液中制得的复合材料、未添加任何增强物质的空白组进行比较,探索一种能够提高SiO2在基体中的分散性,为义齿复合材料的研究和开发提供理论依据和参考。方法1．将偶联剂KH-570处理过的SiO2纳米粒子与PMMA通过接枝共聚，得到预聚体经热熔成型制得实验组的标准试件。2．将KH-570处理过的SiO2纳米粒子直接分散至PMMA乳液中，经热熔成型制得对照组的标准试件。3．利用实验室方法制得PMMA，制成空白组1的标准试件。4．将临床牙托粉制成空白组2的标准试件。5．对表面改性后的SiO2纳米粒子进行FTIR测试表征。6．对接枝PMMA后的纳米复合物进行FTIR测试表征。7．对四种标准试件进行机械性能测试，通过对比四种不同材料机械性能，并结合相关文献，对偶联剂进行SiO2纳米粒子表面改性以及接枝PMMA的作用和机理进行了分析和论述。结果1．FTIR：FTIR证明了在SiO2表面成功地键合了偶联剂KH-570，并在此基础上接枝了大分子PMMA，实现了对SiO2纳米粒子表面的改性，使其在PMMA中的分散性加强。2．试件断口通过扫描电镜的观测，初步达到纳米级的分散。3．挠曲实验和弹性模量实验表明接枝后的纳米复合材料力学性能比空白组1提高了98．7％，比空白组2提高约10．4％。结论1．用偶联剂KH-570对SiO2纳米粒子进行表面改性是有效的、可行的，偶联剂已与SiO2表面发生了化学反应，使SiO2纳米粒子在PMMA中的分散性提高。2．经KH-570处理过的SiO2纳米粒

The research about improving the performance of the material of artificial teeth by drafting PMMA on SiO2 surface

Objective To Treating the nano-SiO2 particle by silicon coupling reagent, functionalize the SiO2 by making double bond on its surface. Polymerizing on the surface of nano-SiO2 surface by the method called emulsion polymerization, the nano-SiO2 is covered by polymer to get the PMMA-KH-570-nano-SiO2 complex material. Test the surface structure of the surface of nano-SiO2 by FTIR, and test sort of its mechanical performances. Comparing the treated nano-SiO2 which is directly dispended in the PMMA emulsion with the SiO2 without any treatment（control group）, we are trying to find an effective method which can not only increase the dispersion of SiO2, but also improve the mechanical performance of the artificial teeth. Methods Coupling agent KH-570 will be treated with nano-SiO2 through graft PMMA, have been prepolymer by the hot-melt molding system in the experimental group were the standard sample; 1.KH-570 will be treated nano-SiO2 dispersed directly to PMMA emulsion, as a hot-melt molding system in the control group of standard sample; 2. The use of laboratory methods to produce PMMA,is the standard blank Group 1 sample; 3.Clinical Tray will be made of powder blank Group 2 of the standard sample; 4.On the surface modified nanoparticles SiO2 for FTIR characterization testing; 5.PMMA on the nano-composites for FTIR characterization testing; 6.Of the four standard sample for testing mechanical properties, by comparing four different mechanical properties of materials, combined with literature, for coupling nano-SiO2 surface modified PMMA, as well as the role and mechanism analysis and discussion. Results FTIR： FTIR proved successful in SiO2 on the surface of the bonding agent KH-570, On the basis of the g-PMMA macromolecules, The realization of the SiO2 nanoparticles surface modified. PMMA in its dispersion strengthening. 1 .Sample surface by SEM observation, reached a preliminary nano-dispersion. 2.Flexural modulus of elasticity and experimental results show that after the grafting of nanocomposite mechanical p