论文部分内容阅读
采用聚丙烯酰胺凝胶法合成纳米ZnO粉体,研究了其制备过程中的分散性行为,并采用非离子表面活性剂对其进行表面改性。结果表明:纳米ZnO粉体的分散性随超声反应时间的延长而显著变好,随溶剂中无水乙醇含量的增加分散稳定性急剧下降。对单一分子量的乙二醇(PEG)改性纳米ZnO的分散性的研究表明,低分子量PEG改性纳米ZnO随PEG浓度的降低分散性逐渐变差,高分子量PEG改性纳米ZnO随PEG浓度的降低分散性先变好而后变差;低浓度PEG改性纳米ZnO的分散性随PEG分子量的增加先变好后变差,高浓度PEG改性纳米ZnO随PEG分子量的增加逐渐变差。不同分子量复合PEG改性纳米ZnO粉体的分散性的研究表明,高浓度复合后的粉体的分散性变差,低浓度复合后粉体的分散性得到不同程度的改善。
The nano-ZnO powder was synthesized by polyacrylamide gel method, the dispersibility in the preparation process was studied, and the surface modification was carried out by using nonionic surfactant. The results show that the dispersibility of nano-ZnO powder is obviously improved with the extension of ultrasonic reaction time, and the dispersion stability decreases sharply with the increase of absolute ethanol content in the solvent. The dispersibility of single-molecular-weight ethylene glycol (PEG) -modified nano-ZnO showed that the dispersibility of low molecular weight PEG-modified nano-ZnO decreased with the decrease of PEG concentration. The high molecular weight PEG-modified nano- The dispersion of PEG with low concentration changed first and then became worse. The dispersion of PEG with low concentration changed firstly and then became worse with the increase of PEG molecular weight. The PEG with high concentration changed gradually with the increase of PEG molecular weight. The study on the dispersibility of different molecular weight PEG-modified nano-ZnO powders showed that the dispersibility of the powders after the high concentration composite decreased, and the dispersibility of the powders after the low concentration composite was improved to some extent.