摘要
通过共混法制备丙烯酸酯聚合物/SiO2(PA/SiO2)杂化乳液,成膜过程添加醇类共溶剂促进偶联改性的聚合物与硅溶胶(SiO2)颗粒之间发生溶胶-凝胶反应。SEM图证实,无共溶剂的杂化涂膜SiO2颗粒趋于表面迁移及团聚,而异丙醇作共溶剂时SiO2颗粒在杂化涂膜表面均匀分散。成膜过程中添加15%异丙醇,杂化涂膜的耐化学品性和硬度等性能最佳。水接触角分析证实,添加共溶剂的杂化涂膜具有更好的耐水性能。AFM图表明,无共溶剂的杂化涂膜表面存在高度为217.9nm的团聚体;添加异丙醇的杂化涂膜表面粒子高度为65.97nm,略高于SiO2颗粒粒径,说明SiO2颗粒均匀分散在杂化涂膜表面。
Polyacrylate/SiO2 hybrid emulsions were prepared by directly mixing method.Sol-gel reactions were carried out between modified polyacrylate and colloidal silica by addition of cosolvent during film formation.Scanning electron microscope（SEM）confirmed that surface migration and aggregation of SiO2 particles occurred during film-formation without addition of cosolvent.However,SiO2 particles dispersed uniformly on the surface of hybrid films with addition of isopropanol during film-formation.The hybrid film exhibited the best chemical resistance and hardness at an isopropanol dosage of15%.The results of water contact angle（WAC）confirmed that hybrid films with addition of isopropanol exhibited better water-resistance.Atomic force microscope（AFM）disclosed that aggregates with height 217.9nm were observed without addition of cosolvent.Meanwhile,the height of particles on hybrid films with addition of isopropanol was 65.97 nm,slightly larger than SiO2 particles,which shown that SiO2 particles dispersed uniformly on the surface of hybrid films.
出处
《化工新型材料》
CAS
CSCD
北大核心
2015年第2期164-166,共3页
New Chemical Materials
基金
东莞理工学院大学生创新创业训练项目(1181912024
1181913013)
