铁质纳米粉体对甲基乙烯基硅橡胶表面性质的影响*

背景：铁质纳米粉体填入甲基乙烯基硅橡胶可构建出X射线平片可视的新型复合材料,但复合材料的表面性质尚不清楚。 目的：探讨铁质纳米粉体对甲基乙烯基硅橡胶表面性质的影响。 方法：将前期制备出的纳米铁粉增强硅橡胶和碳包铁粉增强硅橡胶复合材料作为实验组,甲基乙烯基硅橡胶为对照组比较观察。 结果与结论：与对照组的表面性质相比,实验组材料的表面变化包括表面粗糙度的Ra值和Ry值升高,纳米铁粉升高Ry值的效果更为明显;基胶分子链之间的纳米颗粒增多;表面C、O、Si等元素的原子百分比发生变化,碳包铁粉升高表面含碳基团的幅度较大;添加纳米铁粉的表面水接触角小幅减小,表面能却降低;添加碳包铁粉的表面水接触角小幅升高,表面能增加;表面自由能的极性分量增加。说明纳米铁或碳包铁均导致甲基乙烯基硅橡胶表面性质的改变,但变化的结果不全相似,这与纳米铁和碳包铁的结构、化学组成不同有关。

Effect of ferric nanoparticles on surface properties of methyl vinyl silicone rubber

BACKGROUND: X-ray image visible new composites can be harvested after ferric nanoparticles being mixed with methyl vinyl silicone rubber (MVSR), however, surface properties of the composites still unclear. OBJECTIVE: To explore the effects of ferric nanoparticles on surface properties of MVSR. METHODS: Both previously prepared iron nanoparticle enhanced silicone rubber (INESR) and carbon-coated ferric nanoparticle enhanced silicone rubber (Fe/CESR) were chosen to be experimental group, MVSR as a control group. The surface roughness, topography, chemical components, water and diiodomethane contact angles as well as free energy of above-mentioned groups were tested respectively. RESULTS AND CONCLUSION: Compared with MVSR, the changes of surface property in the experimental groups including the increase of both Ra and Ry values of roughness, the rise of Ry values was more apparent by adding into iron nanoparticles, more nanoparticles existed among molecular chains of base rubber, atomic percentages of C, O and Si in the surfaces had been altered with a big increase in carbon-based groups caused by carbon-coated ferric nanoparticles, small decreases of water contact angles and surface free energy by adding nanoparticles and a small increase of that by adding carbon-coated ferric nanoparticles, the polar components of free energy were promoted. MVSR added with iron nanoparticles or carbon-coated nanoparticles resulted in changes of its surface property, but the changes caused by the two metal nanoparticles were not completely similar, those attributed to the structure and chemical component differences existing between the nanoparticles.