DISTRIBUTION EQUILIBRIUM OF POLY(ETHYLENE OXIDE) IN SODIUM DODECYL-SULFATE MICELLAR SOLUTIONS - AN NMR PARAMAGNETIC RELAXATION STUDY

被引:118
作者
GAO, ZS [1 ]
WASYLISHEN, RE [1 ]
KWAK, JCT [1 ]
机构
[1] DALHOUSIE UNIV,DEPT CHEM,HALIFAX B3H 4J3,NS,CANADA
关键词
D O I
10.1021/j100154a081
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The apparent distribution coefficient of poly(ethylene oxide) (PEO) in sodium dodecyl sulfate (SDS) micelles has been determined by using the NMR paramagnetic relaxation method. The influence of PEO molecular weight, terminal group, and concentration on the solubilization equilibrium is examined. For low molecular weight PEO (MW < 4000) the degree of solubilization increases with increasing molecular weight. Also, the degree of solubilization of PEO increases when the terminal group of the polymer is changed from -OH to -OCH3. For PEO with a molecular weight higher than 4000, the degree solubilization remains constant at 0.85 +/- 0.02 and the solubilization capacity of the SDS micelle is ca. 1.9 PEO monomer units per dodecyl sulfate ion. The location of PEO in the SDS micelles has been investigated by measuring the degree of solubilization in the presence of high concentrations of NaCl. The results suggest that only a small fraction of the PEO is located in the micellar electric double layer.
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页码:462 / 467
页数:6
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