Yin Nianwei, Chen Keqiang, Kang Wei
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, PR China.
Ultrason Sonochem. 2006 May;13(4):345-51. doi: 10.1016/j.ultsonch.2005.03.006. Epub 2005 Jun 2.
A kind of nano particle of butyl acrylate (BA)/styrene (ST)/acrylamide (AM) was prepared through a new method that was ultrasonic emulsifier-free emulsion polymerization, which was a kind of environmental protection and economical method. And no any volatile organic solvent (VOC), emulsifier and initiator were used in this method. Only water was used as solvent. The effects of sonic intensity, sonic time, inorganic salt content, N2 flow velocity, etc. on monomer conversion were studied. TEM photographs showed that its particles size was about 80 nm, which was less than particles size (about 140 nm) through conventional emulsifier-free emulsion polymerization method. The FTIR spectrum showed that after extracted by water for 48 h, CHCl3 for 48 h and THF for 48 hr, respectively, the sample obtained by this way was a ternary copolymer of BA, ST and AM, but not a blend of poly(butyl acrylate), polystyrene and polyacrylamide.
通过一种新方法——超声无乳化剂乳液聚合制备了一种丙烯酸丁酯（BA）/苯乙烯（ST）/丙烯酰胺（AM）纳米粒子，这是一种环保且经济的方法。该方法不使用任何挥发性有机溶剂（VOC）、乳化剂和引发剂，仅用水作为溶剂。研究了超声强度、超声时间、无机盐含量、氮气流速等对单体转化率的影响。透射电子显微镜（TEM）照片显示其粒径约为80 nm，小于通过传统无乳化剂乳液聚合法制备的粒径（约140 nm）。傅里叶变换红外光谱（FTIR）表明，分别用水萃取48小时、用三氯甲烷萃取48小时和用四氢呋喃萃取48小时后，通过这种方法得到的样品是BA、ST和AM的三元共聚物，而不是聚丙烯酸丁酯、聚苯乙烯和聚丙烯酰胺的共混物。
