MICROSTRUCTURAL CHARACTERIZATION OF NOVEL PHENOLIC ORGANOGELS THROUGH HIGH-RESOLUTION NMR-SPECTROSCOPY

被引:65
作者
TATA, M
JOHN, VT
WAGUESPACK, YY
MCPHERSON, GL
机构
[1] TULANE UNIV,DEPT CHEM,NEW ORLEANS,LA 70118
[2] TULANE UNIV,DEPT CHEM ENGN,NEW ORLEANS,LA 70118
关键词
D O I
10.1021/j100065a042
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
We have recently shown that novel organogels can be formed through hydrogen-bonding associations between a variety of phenols and the anionic head group of the surfactant sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in a nonpolar solvent. These hydrogen-bonding forces can be easily broken by simple means such as by heating or, more interestingly, by exposure to moisture, causing the gel to soften or melt. Here, we investigate the gel microstructure and the nature of;molecular organization by high-resolution NMR spectroscopy. The studies indicate that the motion of the phenol molecules is severely restricted, while the surfactant is apparently capable of relatively unhindered motion on the NMR time scale. From H-1 coupling constant information, it appears that gel formation does not significantly affect the surfactant equilibrium rotamer distribution but decreases the energy barrier for interconversion. A picture of the gel is constructed to account for the observed spectral features.
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收藏
页码:3809 / 3817
页数:9
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