Modification of the Lamellar Phase in C12E5/Water System by a Random Hydrophilic-Hydrophobic Polyelectrolyte
Modification of the Lamellar Phase in C12E5/Water System by a Random Hydrophilic-Hydrophobic Polyelectrolyte
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无规亲水-疏水聚电解质对 C12E5/水体系中层状相的改性
DOI：
10.1051/jp2:1997193
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
C. Williams
中科院分区：
文献类型：
--
作者：
E. Z. Radlinska;T. Gulik‐Krzywicki;F. Lafuma;D. Langevin;W. Urbach;C. Williams
在室温下研究了非离子表面活性剂（正十二烷基五氧乙二醇醚，C12E5）、水和磺化度为 30% 至 90% 的水溶性无规杂聚物聚（苯乙烯-r-苯乙烯磺酸钠）三元体系的微观结构。使用小角度 X 射线散射和冷冻断裂电子显微镜，我们重点关注层状相区域，并沿着表面活性剂与水比率恒定且聚合物含量增加的四个不同路径研究样品。我们证明，对于低含水量的样品（S/W 比 3.4 和 4.9），无论聚合物的磺化程度如何，层状相都会持续达到聚合物的几个重量百分比，并且聚合物分子被限制在表面活性剂双层内。随着聚合物数量的增加，层状相布拉格峰以与层状周期增加一致的方式移动，这表明双层厚度增加。对于表面活性剂浓度较低的混合物，当聚合物量增加时，所有聚合物装料含量都观察到一级相变。对于低电荷含量的聚合物（30%和45%），聚合物掺杂的表面活性剂双层的层状堆叠与立方相或另一种层状相共存，并且仅观察到微观相分离。对于大电荷含量（65% 和 90%），富含表面活性剂的层状相与富含聚合物的水溶液共存。这表明观察到的相行为是由自由水分子的浓度控制的。
The microstructure of a ternary system of a non-ionic surfactant (n–dodecyl pentaoxyethylene glycol ether, C12E5), water and a water-soluble random heteropolymer, poly (styrene-r-Na styrene sulfonate) with degrees of sulfonation ranging from 30% to 90% is investigated at room temperature. Using small angle X-ray scattering and freeze-fracture electron microscopy we focus on the lamellar phase region and study samples along four different paths of constant surfactant-to-water ratio with increasing polymer content. We demonstrate that for samples with low water content (S/W ratios 3.4 and 4.9), regardless of the sulfonation degree of the polymer, the lamellar phase persists up to several weight percent of polymer and the polymer molecules are confined inside the surfactant bilayers. With increasing quantity of polymer the lamellar phase Bragg peak shifts in a manner consistent with the increase of the lamellar period, which indicates increased bilayer thickness. For mixtures less concentrated in surfactant first order phase transitions are observed for all polymer charge contents when the amount of polymer is increased. For low charge contents of polymer (30% and 45%) the lamellar stack of the polymer-doped surfactant bilayers coexists with either cubic or another lamellar phase and microscopic phase separation is only observed. For large charge contents (65% and 90%) a surfactant-rich lamellar phase coexists with a polymer-rich water solution. It is suggested that the observed phase behaviour is governed by the concentration number of free water molecules.