用热分析技术测定碳化硅粉体对聚乙二醇的吸附量

Adsorption of Polyethylene Glycol on Silicon Carbide Measured by Thermal Gravimetric and Differential Thermal Analysis

用热分析技术TG-DTA(thermal gravimetric and differential thermal analysis)测定浆料中碳化硅粉体对分散剂聚乙二醇PEG(polyethylene glycol)的吸附量.结果显示PEG在Ar气氛中411.5℃时完全分解;碳化硅表面分散剂PEG的吸附量随着pH的增大而下降,在较高pH下大多数分散剂仍存在于溶液中;分散剂PEG的吸附量通过公式(1)进行计算.该方法简单方便,可以应用于测量氧化物或非氧化物吸附紫外-可见分光光度法不能测定的一些有机聚合物分子.

The adsorption of polyethylene glycol （PEG） on SiC surface was measured by thermal gravimetric （TG） and differential thermal analysis （DTA）. The result showed that PEG completely decomposed at 411.5 ℃ in Ar atmosphere. The adsorption amount decreased with the increase of pH and most free dispersant remained in liquid phase at higher pH. The adsorption amount was calculated by the formula （1）. This method is adapted to measure the adsorption of organic polymer on oxide or non-oxide which can＇t be analyzed by ultraviolet-visible spectrometry.