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目的:研究添加不同浓度的表面改性纳米SiOx对A-2186硅橡胶机械性能的影响。方法:将表面有机改性纳米SiOx分别按照2、4、6wt%的比例加入A-2186硅橡胶,固化后得到3组实验样品,未添加表面有机改性纳米SiOx的A-2186硅橡胶作为对照组。按照ASTM标准制作试件,测试材料的拉伸强度、拉断伸长率、撕裂强度、邵氏A硬度。采用SPSS10.0软件包对数据进行统计学分析。结果:添加表面有机改性纳米SiOx后,A-2186硅橡胶的拉伸强度自(6.16±0.27)MPa显著下降(P<0.001)。表面有机改性纳米SiOx添加量为2wt%时,其拉断伸长率(292.20±6.26)%较对照组(314.40±8.05)%下降,无统计学差异(P=0.068)。其余各实验组与对照组相比,差异有统计学意义。表面有机改性纳米SiOx加入量为2、4wt%时,A-2186硅橡胶的撕裂强度(12.50±0.96)kN/m分别提高至(21.96±1.02)kN/m、(18.22±1.07)kN/m,均较对照组有统计学差异(P<0.001);其中,2wt%组高于4wt%组,两者差异显著(P<0.001)。加入表面有机改性纳米SiOx使A-2186硅橡胶的邵氏A硬度(29.00±2.55)U增加,各实验组均与对照组有统计学差异,加入6wt%时,硬度达到最大(35.60±1.14)U(P<0.001)。结论:加入表面有机改性纳米SiOx会影响A-2186硅橡胶的机械性能,加入2、4wt%能显著改善A-2186硅橡胶的撕裂强度,但同时降低了硅橡胶的拉伸强度、增加了邵氏(A)硬度。
Objective: To study the effects of adding different concentrations of surface-modified nano-SiOx on the mechanical properties of A-2186 silicone rubber. Methods: The surface modified organically modified nano-SiOx was added into A-2186 silicone rubber in the proportion of 2, 4 and 6wt%, respectively. Three groups of experimental samples were obtained after curing. A-2186 silicone rubber with no organic modified nano-SiOx was added as control group. Specimens were made according to ASTM standards and tested for tensile strength, elongation at break, tear strength, Shore A hardness. SPSS10.0 software package for statistical analysis of the data. Results: The tensile strength of A-2186 silicone rubber decreased significantly from (6.16 ± 0.27) MPa (P <0.001) after the addition of surface-modified nano-SiOx. The tensile elongation at break (292.20 ± 6.26)% was significantly lower than that at the control (314.40 ± 8.05)% when the amount of organic modified nano-SiOx was 2wt%, which showed no significant difference (P = 0.068). The remaining experimental groups compared with the control group, the difference was statistically significant. The tear strength (12.50 ± 0.96) kN / m of A-2186 silicone rubber increased to (21.96 ± 1.02) kN / m and (18.22 ± 1.07) kN when the amount of organic modified nano-SiOx was2.4wt% / m, which were significantly higher than that of the control group (P <0.001). Among them, 2wt% group was higher than 4wt% group, the difference was significant (P <0.001). The hardness of A-2186 silicone rubber (29.00 ± 2.55) U increased with addition of surface-modified nano-SiOx. The hardness of A-2186 silicone rubber reached the maximum (35.60 ± 1.14 ) U (P <0.001). CONCLUSION: The mechanical properties of A-2186 silicone rubber can be affected by the addition of surface-modified nano-SiOx. The addition of 2, 4wt% can significantly improve the tear strength of A-2186 but reduce the tensile strength of silicone rubber and increase Shore (A) hardness.