支链化甜菜碱和阳离子表面活性剂在聚甲基丙烯酸甲酯表面的吸附及其润湿性质

发布时间：2018-05-23 08:53

本文选题：支链化 + 甜菜碱　；参考：《物理化学学报》2016年05期

【摘要】：利用座滴法研究了两性离子表面活性剂支链十六烷基(聚氧乙烯)_n醚羟丙基羧酸甜菜碱(n=0,3)和阳离子表面活性剂支链十六烷基(聚氧乙烯)n醚羟丙基季铵盐溶液在聚甲基丙烯酸甲酯(PMMA)表面上的润湿性质,考察了表面活性剂类型、结构及浓度对接触角的影响趋势。研究发现,表面活性剂浓度低于临界胶束浓度(cmc)时,分子通过氢键以平躺的方式吸附到PMMA界面,亲水基团靠近固体界面,PMMA表面被轻微疏水化;表面张力和粘附张力同时降低,导致此阶段接触角随浓度变化不大。浓度高于cmc时,表面活性剂通过疏水作用吸附,亲水基团在外,PMMA表面被明显亲水改性,接触角随浓度升高显著降低。由于具有相同的支链烷基,表面活性剂类型变化和聚氧乙烯基团的引入对接触角影响不大。
[Abstract]:The hexadecyl groups of amphoteric ionic surfactants and cetylated cetyl groups were studied by drop method in the presence of poly (ethylene oxide) and cetylated cetyl groups (polyoxyethyleneurane hydroxyl propyl quaternary ammonium salts) and cetylated cetyl groups (polyoxyethylene hydroxyl propyl hydroxypropyl quaternary ammonium salts) and cetyl groups. Wetting properties on the surface of polymethyl methacrylate (PMMA), The effects of surfactant type, structure and concentration on contact angle were investigated. It was found that when the surfactant concentration was lower than the critical micelle concentration, the molecules were adsorbed to the PMMA interface by hydrogen bond in a flat way, the hydrophilic group was slightly hydrophobic near the solid interface, and the surface tension and adhesion tension decreased simultaneously. As a result, the contact angle varies little with concentration at this stage. When the concentration is higher than that of cmc, the surfactant is adsorbed by hydrophobic interaction, the hydrophilic group is obviously modified by hydrophilicity, and the contact angle decreases with the increase of concentration. Because of the same branched alkyl group, the change of surfactant type and the introduction of polyoxyethylene group have little effect on the contact angle.
【作者单位】：中国石化胜利油田分公司油气开发管理中心;中国科学院理化技术研究所;北京大学化学与分子工程学院;
【基金】：国家科技重大专项(2016ZX05011-003)资助项目~~
【分类号】：O647.2

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