Abstract
Nonionic associative polymers have been produced by hydrophobically modifying poly(oxyethylene) with hydrophobic end group straight hydrocarbon chain length varying from 8 to 18 carbon atoms. Pulsed gradient spin-echo Fourier transform NMR (PGSE-FT NMR) and rheology measurements on aqueous solutions of these polymers reveal a distribution of self-diffusion coefficients that broadens continuously with increasing concentration. The distribution is described by a stretched exponential from which mean diffusion coefficients are extracted. The concentration dependences of these diffusion coefficients are described by the stretched exponential of Phillies
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