摘要
采用Shirasu多孔玻璃(SPG)膜乳化法制备了单分散含对苯二甲酰氯(TDC)单体的O/W乳液,系统地研究了SPG膜乳化过程的影响因素.实验结果表明,采用SPG膜乳化法制备单分散O/W乳液时,选择阴离子表面活性剂比考虑亲水亲油平衡(HLB)匹配更重要;增大分散相或连续相的黏度,能够改善乳液的单分散性和稳定性;随着单体浓度增加,乳液的单分散性变差,液滴的平均粒径逐渐变小.当SPG膜孔径大于1.0μm左右时,可得到单分散的含TDC单体乳液;而当孔径小于1.0μm左右时,水分子更容易扩散并溶解到油水界面甚至油相内部与TDC生成对苯二甲酸(TPA),TPA积累到一定程度在油水界面上析出将膜孔堵塞,从而无法制得单分散乳液.随着乳化时间增长,乳液的平均直径逐渐变小、单分散性逐渐变差.
Monodispersed oil-in-water （O/W） emulsions containing monomer terephthaloyl dichloride （TDC） were prepared by Shirasu-porous-glass （SPG） membrane emulsification method, and the factors influencing the emulsification process were experimentally investigated. The results showed that to prepared monodisperse O/W emulsions by SPG membrane emulsification, it was more important to choose an anionic surfactant than to consider hydrophile-lipophile balance （HLB） matching. Both the monodispersity and stability of emulsions could be improved by increasing the viscosity of disperse phase or continuous phase. With increasing monomer concentration inside the disperse phase, the monodispersity of emulsions became slightly worse and the mean diameter of emulsions gradually became smaller. Monodisperse monomer-containing emulsions were obtained when the SPG membrane pore size was larger than 1.0 μm; however, when the SPG membrane pore size was smaller than 1.0 μm, no monodisperse emulsions were obtained because of the formation and chokage of p-phthalic acid （TPA） crystals in the pores of the SPG membrane. With increasing emulsification time, the average emulsion diameter generally decreased, and the monodispersity of emulsions gradually became worse.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第4期874-879,共6页
CIESC Journal
基金
国家自然科学基金项目(20206019)
教育部跨世纪优秀人才基金(200248)
四川省杰出青年基金(03ZQ02641)
四川大学科技创新基金项目(2004CF06).~~
