添加表面改性纳米二氧化钛对A-2186赝复硅橡胶机械性能的影响  

Study on the effects of surface modified nano titanium-oxide on the mechanical properties of A-2186 silicone elastomers

作　　者：韩颖[1] 赵铱民[1] 谢超[1] 吴国锋[1] 

机构地区：[1]西安第四军医大学口腔医院修复科,710032

出　　处：《实用口腔医学杂志》2008年第4期478-481,共4页Journal of Practical Stomatology

基　　金：国家自然科学基金项目(编号:30471908)

摘　　要：目的:研究添加不同质量比的表面改性纳米二氧化钛(TiO2)对A-2186硅橡胶机械性能的影响。方法:将经过表面有机改性的纳米TiO2分别按(质量分数)0.0%、0.5%、1.0%、1.5%、2.0%、2.5%、3.0%加入A-2186硅橡胶中,依据ASTM相关标准制作试件并测定7组硅橡胶的抗拉强度、断后伸长率、撕裂强度及邵氏A硬度,扫描电镜观察试样断面情况,并做能谱分析。结果进行统计学分析。结果:随着纳米TiO2添加量的增加,A-2186硅橡胶的抗拉强度、断后伸长率、撕裂强度呈现先增加,后降低的趋势,1.5%、2.0%、2.5%、3.0%组与对照组有统计学差异;邵氏A硬度逐渐增大,各实验组与对照组之间无统计学差异。当纳米TiO2添加量达到胶料的2.0%时,扫描电镜观察纳米TiO2分散良好,未发生团聚,此时A-2186硅橡胶的机械性能综合评价为最优:邵氏A硬度为(31.00±0.79)U,断后伸长率为(618.00±7.58)%,抗拉强度为(6.54±0.55)MPa,撕裂强度为(16.64±0.52)kN/m。结论:表面有机改性纳米TiO2按胶料的2.0%加入时,对A-2186硅橡胶机械性能的改善为最优。Objective：To evaluate the effects of surface modified nano titanium-oxide on the mechanical properties of A-2186 silicone elastomers. Methods： Added surface modified nano titanium-oxide into A-2186 silicone elastomers with 0.0% , 0.5% , 1.0% , 1.5% , 2.0% , 2.5% and 3.0% additions according to the ASTM standard. The mechanical properties of A-2186 silicone elastomer including the tensile strength, the broken elongation, the tear strength and the Shore-A hardness were tested separately. The section of samples were investigated by scanning electron microscope and energy spectrum analysis. Used statistics method to analyse the results. The results were analysed with software EPSS 13. O. Results：With the addition of nano titanium-oxide increasing, the tensile strength, the broken elongation and the tear strength of A-2186 silicone elastomers increased firstly, and then decreased. While the Shore-A hardness of A-2186 silicone elastomers increased gradually. When the addition of surface modified nano titanimu-oxide reached to 2.0%, the nano titanium-oxide dispersed well in the base without agglomeration. Under such condilition, the A-2186 silicone elastomer showed the best general mechanical properties：the tensile strength was （6.54 ±0.55 ） MPa, the broken elongation was 618.00 ± 7.58 （ % ）, the tear strength was （ 16.64 ±0. 52 ） kN/m and the Shore-A hardness was （31.00 ＋ 0. 79） U. Condusion：Tbe mechanical properties of A-2186 silicone elastomers are improved most greatly wlth 2.0% addition of surface modified nano titanium-oxide to the base of A-2186 silicone elastomers.

关 键 词：表面有机改性 纳米二氧化钛 硅橡胶 机械性能 

分 类 号：R783.1[医药卫生—口腔医学]