气相二氧化硅物理吸附水测定及与表面硅羟基含量之间关系  

Determination of Physical Adsorption Water of Fumed Silica and Its Relationship with Surface Silanol Concentration

作　　者：修昊 段先健 张婷婷 赵友博 郭真有 吴春蕾 王跃林 傅强[1] Hao Xiu;Xianjian Duan;Tingting Zhang;Youbo Zhao;Zhenyou Guo;Chunlei Wu;Yuelin Wang;Qiang Fu(College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;Guangzhou Huifu Research Institute Co.,Ltd.Guangzhou 510663,China)

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室(四川大学),四川成都610065 [2]广州汇富研究院有限公司,广东广州510663

出　　处：《高分子材料科学与工程》2021年第1期102-108,149,共8页Polymer Materials Science & Engineering

基　　金：湖北汇富纳米材料股份有限公司资助;广州汇富研究院有限公司项目(17H0353);国家自然科学基金青年基金资助项目(51803130);中国博士后科学基金面上项目(2018M640915);四川省科技计划(2019JDRC0107)。

摘　　要：热重分析法测定气相二氧化硅表面硅羟基含量操作简便、无化学试剂、误差小,近年来越来越受到关注。但是,其中物理吸附水脱除的条件还存在争议。文中选用国内外2家代表性公司生产的相同比表面积的气相二氧化硅为对象,详细地研究了升温模式、升温速率、等温温度和等温时间对其表面物理吸附水脱除的影响。确定了物理吸附水脱除的最优测试条件:10℃/min升温至200℃等温5 min。对比发现,相同条件下,国外产品的脱水量高于国内产品,这可能是由于国外产品具有更高的硅羟基含量所致。本工作不但找到了国内外产品关键性能的差距,而且完善了热重分析法测定气相二氧化硅表面羟基含量,并为相关测试标准的发展提供技术支撑。Using thermo-gravimetric analysis(TGA)to determine the silanol concentration on the surface of fumed silica has attracted more and more attentions in recent years due to its many advantages,such as easy to operate,absent of chemical reagent and little error of the measurement results.However,there are still controversies regarding the experimental conditions for the effective removal of physically adsorbed water of fumed silica.In this article,fumed silica with a specific surface area of 200 m 2/g produced by two representative companies both at home and abroad were selected as research object.The effects of the experimental conditions of TGA test,such as heating mode,heating rate,isothermal temperature and isothermal time,on the removal of physical adsorption water on the surface of fumed silica were studied in detail.The optimal experimental conditions for the removal of physically adsorbed water were determined,e.g.increasing the temperature with 10℃/min to 200℃for 5 min.The results of this work not only find the key performance gap between domestic and foreign products,but also further improve the TGA method for determining the surface hydroxyl content of fumed silica and lay a solid foundation for the development of relevant test standards.

关 键 词：气相二氧化硅 硅羟基 热重分析 物理吸附水 

分 类 号：TQ127.2[化学工程—无机化工]