物理化学学报 >> 2016, Vol. 32 >> Issue (6): 1482-1488.doi: 10.3866/PKU.WHXB201603153

论文 上一篇    下一篇

反相破乳剂SP169及DMEA169在溶液中的聚集行为

王榕,段明*(),熊艳,宋先雨,方申文   

  • 收稿日期:2015-12-21 发布日期:2016-06-03
  • 通讯作者: 段明 E-mail:swpua124@163.com
  • 基金资助:
    国家自然科学基金(21376193);教育部新世纪优秀人才支持计划(NCET-13-0983);四川省青年科技创新研究团队专项计划(2015TD0007)

Aggregation Behaviour of Reversed Demulsifiers SP169 and DMEA169 in Aqueous Solution

Rong WANG,Ming DUAN*(),Yan XIONG,Xian-Yu SONG,Shen-Wen FANG   

  • Received:2015-12-21 Published:2016-06-03
  • Contact: Ming DUAN E-mail:swpua124@163.com
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21376193);Program for New Century Excellent Talents in University, China(NCET-13-0983);Foundation of Youth Science and Technology Innovation Team of Sichuan Province, China(2015TD0007)

摘要:

以芘(Py)为荧光探针,十六烷基氯化吡啶(CPC)为猝灭剂,采用稳态荧光探针法测定了反相破乳剂SP169和DMEA169的临界胶束浓度(cmc)及胶束聚集数(Nagg),并考察了两者在溶液中形成的胶束内部的微环境极性大小,采用动态光散射法测定了两者胶束的流体力学直径(Dh),并通过耗散粒子动力学(DPD)方法模拟了两者在溶液中聚集形态的动力学变化过程。结果表明,两者的临界胶束聚集数分别为Nm(SP169)=28,Nm(DMEA169)=18;SP169的流体力学直径小于DMEA169,但其增长速度前者大于后者;DPD模拟的结果显示,由于起始剂在胶束内部与其他粒子间相互作用的不同,SP169聚集成棒状胶束,而DMEA169聚集成舒展的球状胶束,这解释了实验结果:相同浓度下前者胶束的流体力学直径及胶束内部的微环境极性皆比后者小,同时由于SP169起始剂的疏水性,使得其具有较大的胶束聚集数。

关键词: 反相破乳剂, 聚集行为, 起始剂, 耗散粒子动力学, 荧光探针法, 动态光散射法

Abstract:

The critical micelle concentrations(CMCs)of the reversed demulsifiers poly(propylene oxide)-blockpoly(ethylene oxide)-block-poly(propylene oxide)(PPO-PEO-PPO),SP169,and DMEA169 were measuredby steady-state fluorescence spectroscopy,with cetylpyridinium chloride(CPC)as the quencher and pyreneas the fluorescent probe.The micellar aggregation numbers(Nagg)and the polarity of the micro-environmentsinside the micelles were obtained for the first time.The hydrodynamic diameters of the micelles at differentdemulsifier concentrations were determined by dynamic light scattering(DLS)and the corresponding micelleshapes were simulated by dissipative particle dynamics(DPD).The results indicate that the critical micellaraggregation numbers(Nm)can be extrapolated from the Nagg-cs curves,with Nm(SP169)=28 and Nm(DMEA169)=18.Thehydrodynamic diameter of SP169 is smaller than that of DMEA169,while the acceleration of the former is fasterthan that of the latter.The simulations show that the micelle of SP169 is spherical while that of DMEA169 hasaclavate shape,because of the different interactions resulting from the initiators among the beads.Moreover,the simulations are in good agreement with the experiments in that they find a smaller hydrodynamic diameterand a less polar micro-environment inside the micelle of SP169 compared with that of DMEA169,while theaggregation number of the former is larger than that of the latter.

Key words: Reversed demulsifier, aggregation behaviour, Initiator, Dissipative particle dynamics, Fluorescence probe method, Dynamic light scattering method

MSC2000: 

  • O648