Water partitioning in "dry" poly(ethylene oxide) alcohol (CmEn) nonionic surfactant--a proton NMR study.
A proton NMR titration study is presented where in small increments quantities of water were added to "dry" CmEn nonionic surfactant. For a particular range of compositions, two resonances for the water/hydroxyl protons were observed that display large chemical shift increases as water content is increased indicating that water must partition between two chemical environments with a surprisingly slow chemical exchange rate. A detailed mechanism of how the increasing amounts of water are incorporated into the surfactant medium is presented accounting for all observed spectral changes.
Hoffmann
Markus M
MM
Department of Chemistry, State University of New York College, Brockport, NY 14420, USA. mhoffman@brockport.edu
Bennett
Megan E
ME
Fox
Jack D
JD
Wyman
Donald P
DP