| 超声波对醋酸乙烯乳液（VAC）聚合的影响（英文） |
| |
| 引用本文： | 侯慧玉,胡剑青,涂伟萍.超声波对醋酸乙烯乳液（VAC）聚合的影响（英文）[J].中国科学院研究生院学报,2006,23(5):614-619. |
| |
| 作者姓名： | 侯慧玉 胡剑青 涂伟萍 |
| |
| 作者单位： | 华南理工大学化工与能源学院,广州,510640 |
| |
| 摘 要： | 对比了醋酸乙烯（VAC）在传统聚合中和超声波辅助聚合中的单体转化率和乳液粒径分布的差别。在VAC聚合过程中外加超声波环境，单体转化率从92.5 %提高到98.8%，乳液粒子平均粒径从136.7nm减小到101.4nm。在超声波辅助VAC乳液聚合中，研究了引发剂浓度和反应温度对单体转化率及乳液粒径分布的影响。试验结果表明仅靠超声波产生的自由基不足以引发聚合反应，引发剂分解产生的自由基在引发聚合过程中起着重要的作用。简单介绍了超声波辅助乳液聚合的机理，超声波可以连续提供自由基，而这些自由基的作用是使死聚合物链变的有活性，导致单体具有较高的转化率。
|
| 关 键 词： | 超声波辅助聚合 醋酸乙烯 超声波功率 |
| 文章编号： | 1002-1175(2006)05-0614-06 |
| 修稿时间： | 2005年9月14日 |
Effect of Ultrasonic Wave on the Polymerization of Vinyl Acetate (VAC) Emulsion |
| |
| HOU Hui-Yu,HU Jian-Qing,TU Wei-Ping.Effect of Ultrasonic Wave on the Polymerization of Vinyl Acetate (VAC) Emulsion[J].Journal of the Graduate School of the Chinese Academy of Sciences,2006,23(5):614-619. |
| |
| Authors: | HOU Hui-Yu HU Jian-Qing TU Wei-Ping |
| |
| Institution: | Institute of Chemical Engineering and Energy, South China University of Technology, Guangzhou 510640 |
| |
| Abstract: | The monomer conversion efficiency and average particle size and its distribution of vinyl acetate (VAC) polymerization by conventional and ultrasonic-assisted means individually were compared. With adding ultrasonic waves in the VAC polymerization, the monomer conversion efficiency was increased from 92.5% to 98.8%, and the average particle size of latex was reduced from 136.7nm to 101.4nm. During the process of ultrasonic-assisted polymerization of VAC system, the effects of initiator concentration and reaction temperature on the conversion efficiency and average particle size distribution were studied. The experimental results demonstrated that the radicals generated from ultrasonic energy solely were not enough to propel the polymerization perfectly and the radicals produced by decomposition of initiator play an important role in driving polymerization. Furthermore, the mechanism of ultrasonic-assisted emulsion polymerization was briefly deduced. It was also found that ultrasonic waves maintained a constant supply of radicals and these radicals were able to reactivate some of the non-active polymer chains, so that it resulted in the higher conversion efficiency of the monomer. |
| |
| Keywords: | ultrasonic-assisted polymerization vinyl acetate ultrasonic power |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《中国科学院研究生院学报》浏览原始摘要信息 |
| 点击此处可从《中国科学院研究生院学报》下载免费的PDF全文 |
