自组装囊泡模板法制备酚醛树脂中空微球

Preparation of phenolic resin hollow microspheres by self-assembled vesicle template method

采用十二烷基硫酸钠(SDS)和十六烷基三甲基溴化铵(CTAB)复配体系自组装囊泡为软模板,水溶性酚醛树脂为前驱体,通过调控阴阳离子表面活性剂的摩尔配比得到了一系列酚醛树脂中空微球材料。对合成的材料通过X射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、氮气吸附-脱附分析仪、热重分析仪(TG-DTA)等仪器进行了表征,得到酚醛树脂中空微球的最佳合成条件为n(CTAB)/n(SDS)=1.4、反应温度为70℃、反应时间为48 h、搅拌速率为400 r/min。合成的微球粒径在30~100 nm之间,球壳为多层膜结构,球壳总厚度在8~12 nm左右,结构具有良好的介观周期性。

Phenolic resin hollow microspheres were synthesized by using self-assembled vesicles consisting of sodium dodecyl sulfate(SDS) and cetyltrimethylammonium bromide(CTAB) in a series of molar ratios as soft template, and water-soluble phenolic resin as precursor. The samples were characterized by X-ray diffractometry(XRD), transmission electron microscopy(TEM), scanning electron microscopy(SEM), nitrogen adsorption-desorption analyzer, and thermogravimetric analyzer(TGA). The results indicate that the optimum synthesis conditions for the phenolic resin hollow microspheres were as follows: n(CTAB)/n(SDS)=1.4, the reaction temperature of 70 ℃, the reaction time of 48 h, and the stirring rate of 400 r/min. The diameter of the synthesized microspheres was about 30 to 100 nm. The spherical shell was a multi-layered membrane structure with the thickness about 8 to 12 nm. The structure of samples had a good mesoscopic periodicity.