用于离子迁移谱仪进样的纳米二氧化硅增强硅橡胶膜的制备  

Preparation of nano-silica reinforced silicone rubber membranes for sample inlet of ion mobility spectrometers

作　　者：秦墨林[1] 郭成海[1] 杨柳[1] 赵建军[1] 曹丙庆[1] 

机构地区：[1]防化研究院,北京102205

出　　处：《合成橡胶工业》2015年第3期185-189,共5页China Synthetic Rubber Industry

摘　　要：以六甲基二硅氮烷为改性剂,采用湿法工艺对纳米SiO2进行表面疏水化改性,制备了用于离子迁移谱仪进样的纳米SiO,增强硅橡胶膜,考察了加热温度与反应时间对纳米SiO2的改性效果,研究了改性纳米SiO,与硅橡胶的相容性、纳米SiO,掺杂硅橡胶膜的厚度及拉伸性能.结果表明,在疏水化改性反应中,随着加热温度的升高或反应时间的延长,纳米SiO2表面羟基数下降,比表面积减小,最佳加热温度为120℃,反应时间为4h;随着反应时间的延长,改性纳米SiO2与硅橡胶的混合液透光度增大,说明纳米SiO,与硅橡胶的相容性提高;以聚苯乙烯为基底材料,采用溶剂挥发工艺制得纳米SiO2掺杂硅橡胶膜的拉伸强度随着纳米SiO2掺杂量的增加而增大,当纳米SiO2与硅橡胶掺杂质量比为30：100时,可制得厚为2～5 μm的最薄硅橡胶膜.Surface hydrophobization modification of nano-siliea was conducted in liquid phase with hexamethyldisilazane as modifier, and the modified nano-siliea reinforced silicone rubber membranes were prepared for sample inlet of ion mobility spec- trometer. Effect of heating temperature and reaction time on the modification of nano-silica was studied. And compatibility of modified nano-silica and silicone rubber, thickness and tensile properties of nano-silica reinforced silicone rubber membranes were investiga- ted. The results showed that the surface hydroxyl number and specific surface area of nano-silica de- creased with increasing the heating temperature or ex- tending the reaction time, and the optimum heating temperature and reaction time were 120 ℃ and 4 h.With extending reaction time, transmittance of mixed solution of modified nano-silica and silicone rubber increased, showing that compatibility of nano-silica and silicone rubber was improved. Silicone rubber membranes were fabricated with polystyrene as the substrate material by solvent evaporation method. The tensile strength of silicone rubber membranes rose when the amount of nano-silica increased. Mem- branes with the least thickness of 2 -5 μm were pre- pared when the mass ratio of nano-silica and silicone rubber was 30： 100.

关 键 词：纳米二氧化硅 亲水性 改性 疏水性 增强 硅橡胶膜 离子迁移谱仪 

分 类 号：TQ333.93[化学工程—橡胶工业]