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We prepared a series of modified double-tailed surfactants containing two identical nonionic moieties and an anionic spacer group. Each surfactant was prepared through the reaction of two moles of polyoxyethylene alkyl ether with one mole of maleic anhydride to form a diester having a gemini structure; an anionic sulfonate group was then introduced through reaction of the olefinic bond with sodium...
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