INTERACTION BETWEEN POLY(ETHYLENE OXIDE) AND SODIUM DODECYL SULFATE STUDIED BY NEUTRON REFLECTION
INTERACTION BETWEEN POLY(ETHYLENE OXIDE) AND SODIUM DODECYL SULFATE STUDIED BY NEUTRON REFLECTION
复制标题
通过中子反射研究聚环氧乙烷和十二烷基硫酸钠之间的相互作用
DOI：
10.1021/jp9804291
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发表时间：
1998
影响因子：
3.3
通讯作者：
J. Penfold
中科院分区：
文献类型：
--
作者：
D. Cooke;C. Dong;J. Lu;R. Thomas;E. Simister;J. Penfold
使用中子镜面反射研究了十二烷基硫酸钠 (NaDS) 和聚环氧乙烷 (PEO) 水性混合物的空气/溶液界面组成随 NaDS 浓度的变化以及固定浓度为 0.1 wt% PEO 的情况。随着表面活性剂浓度的增加，聚合物逐渐从表面位移，直到达到临界聚集浓度 (CAC)，不再能够检测到它（每个片段的面积大于约 80 A2）。表面活性剂的吸附随着浓度的增加而稳定增加，并且在 CAC 处没有显示出不连续的迹象（35 °C 时为 4.5 mM），这与仅由本体溶液中表面活性剂/聚合物聚集开始引起的表面张力曲线的中断一致。在所有浓度下，NaDS 的吸附在存在聚合物的情况下，空气/溶液界面处的吸附量比相应的不含聚合物的溶液中的吸附量要少，然而，这表明在吸附过程中存在一定的协同性。
The composition of the air/solution interface of aqueous mixtures of sodiumdodecyl sulfate (NaDS) and poly(ethylene oxide) (PEO) has been studied as a function of NaDS concentration and at a fixed concentration of 0.1 wt % PEO using neutron specular reflection. With increasing surfactant concentration, the polymer is progressively displaced from the surface until, at the critical aggregation concentration (CAC), it can no longer be detected (area per segment greater than about 80 A2. The adsorption of surfactant increases steadily with concentration and shows no sign of a discontinuity at the CAC (4.5 mM at 35 °C), which is consistent with the break in the surface tension curve being caused only by the onset of surfactant/polymer aggregation in the bulk solution. At all concentrations the adsorption of NaDS at the air/solution interface is less in the presence of polymer than that in the corresponding solutions without polymer. Nevertheless, it is shown that there is some cooperativity in the adsorption o...