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Four water-soluble non-ionic ethoxylated surfactants based on vanillin were synthesized (VE15, VE20, VE40, and VE60). The chemical structures of these surfactants were confirmed using FT-IR and 1H-NMR spectra. The molecular weights of the compounds were determined using viscosity measurements and gel permeation chromatography. Surface tension as a function of the concentration of the surfactant in...
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