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以月桂酸为表面处理剂,采用共沸蒸馏的方法对纳米氧化铝进行了有机表面修饰。采用傅立叶变换红外光谱(FTIR)、热分析(TG-DTG)、高分辨透射电镜(HRTEM)、接触角实验和分散性实验对表面修饰前后的纳米氧化铝进行了分析表征。FTIR,TG-DTG和HRTEM分析表明,纳米氧化铝表面与月桂酸之间可能存在桥连结构的化学键作用。通过无水乙醇洗涤可以除去物理吸附的月桂酸,月桂酸在纳米氧化铝表面形成了均匀的单分子化学修饰层,修饰层的厚度为1～2nm。TG-DTG数据显示,纳米氧化铝表面化学吸附的月桂酸的饱和质量分数约为6.28%。接触角实验和分散性实验说明,经月桂酸修饰的纳米氧化铝的表面由亲水性变为疏水性,有效提高了纳米氧化铝在有机基体中的分散性和相容性。
Using lauric acid as surface treatment agent, the surface of nano-alumina was modified by azeotropic distillation. The nano-alumina before and after surface modification was characterized by FTIR, TG-DTG, HRTEM, contact angle and dispersion experiments. FTIR, TG-DTG and HRTEM analysis showed that there may be a chemical bond between the surface of the nano-alumina and lauric acid. Physiologically adsorbed lauric acid can be removed by washing with anhydrous ethanol, and lauric acid forms a uniform single-molecule chemical modification layer on the nano-alumina surface. The thickness of the modification layer is 1-2 nm. TG-DTG data show that the saturated mass fraction of lauric acid chemisorbed on the surface of nano-alumina is about 6.28%. The contact angle experiment and dispersion experiment show that the surface of nano-alumina modified by lauric acid changes from hydrophilic to hydrophobic, effectively improving the dispersibility and compatibility of nano-alumina in organic matrix.