碱式硫酸镁晶须的表面改性  

On the Surface Modification of Basic Magnesium Sulfate Whiskers

作　　者：韩跃新[1] 李丽匣[1] 印万忠[1] 陈旭[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第1期133-136,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50402013)

摘　　要：采用硬脂酸钠对碱式硫酸镁晶须进行了表面改性,应用改性前后碱式硫酸镁晶须的活化指数、吸油值、安息角来评价改性效果,并对改性前后的晶须进行了SEM,TG-DSC和FTIR表征.结果表明,硬脂酸钠对碱式硫酸镁晶须的改性效果显著,改性后的晶须活化指数由0.87%上升到99.21%,吸油值由488 mL/(100 g)下降到349 mL/(100 g),晶须表面由亲水变为疏水,晶须的流动性和分散性得到明显改善.表面改性过程对碱式硫酸镁晶须的热分解没有明显影响,硬脂酸钠与碱式硫酸镁晶须表面既有物理吸附又有化学吸附.The surface of basic magnesium sulfate whiskers were modified with sodium stearate as modifier, and the modification effect was evaluated by activation index, oil adsorption value and rest angle. And the whiskers were characterized beforekind after surface modification by SEM, TG-DSC and FTIR. The results showed that modification effect is so remarkable that the activation index is up to 99.21% from 0.87 %, oil adsorption value loweres to 349 mL/（ 100 g） from 488 mL/（ 100 g）, and the whisker surface bacome hydrophobic from hydrophilic. The liquidity and dispersibility of the modified whiskers are both improved significantly and no obvious effect of the surface modification process is found on the whiskers＇ thermal decomposition. As a conclusion, both the chemical and physical adsorption are functioning sodium stearate and the whisker surface.

关 键 词：碱式硫酸镁晶须 硬脂酸钠 表面改性 分散性 热分解 

分 类 号：TQ132.2[化学工程—无机化工] O614.22[理学—无机化学]