钛酸钾晶须界面性质研究

通过乳液聚合的方法对钛酸钾晶须进行表面改性,获得了表面包裹聚甲基丙烯酸甲酯的钛酸钾晶须. FT-IR、SEM、EDS的表征表明,钛酸钾晶须的表面包裹了聚甲基丙烯酸甲酯膜,形成了以钛酸钾晶须为核,聚甲基丙烯酸甲酯为壳的复合粒子.研究表明,改性后的晶须表面能降低,在有机溶液中的界面张力大大降低,与聚甲基丙烯酸甲酯的界面性质相似,说明改性后的晶须基本被聚甲基丙烯酸甲酯完全包裹,因此晶须由亲水性变为疏水性,在有机溶液中的分散性显著提高.

The Interface Properties of Potassium Titanate Whiskers

This paper investigated a method of modifying potassium titanate whiskers (K2O•6TiO2) to obtain polymethyl methacrylate (PMMA)/K2O•6TiO2 composite particles through emulsion polymerization. The interface properties of pure and modified potassium titanate whiskers were studied in details. According to the characterizations of FT-IR、 SEM and EDS, the surface of the potassium titanate whiskers was covered by PMMA molecules and the composite particles have a core-shell structure. The characterization of surface energy and interfacial tension showed that the interface property of modified whiskers has changed thoroughly and it was similar to that of PMMA, so the whiskers were covered by PMMA thoroughly. It made the potassium titanate whiskers modified from hydrophilic to hydrophobic and the dispersibility of the whiskers in organic liquids improved greatly.