New cationic copolymeric surfactants were synthesized based on the fatty acid obtained from Juagafa seed wastes, which gave an appropriate yield of lauric acid, which upon esterification and reduction pro- cesses was converted to lauryl alcohol. Through the reaction of lauryl alcohol with methacrylic acid (MAA) in the presence of N,N0-dicyclohexylcarbadiimide (DCC), lauryl methacrylate (LMA, as a starting monomer) was obtained. A series of copolymerization feeds between lauryl methacrylate and methacrylic acid in different molar ratios initiated by benzoyl peroxide (BP) were carried out. Also, the obtained data from 1H NMR for the different molar ratios of the poly(LMA-co-MAA) were utilized to esti- mate the monomer reactivity ratio. The synthesized poly(LMA-co-MAA) with different molar ratio was modified by direct amidation with N,N’-dimethyl-1,3-propanediamine. The amidated copolymers (PA1- 5) were quaternized with methyl and ethyl iodides to obtain the corresponding cationic copolymeric sur- factants (PSM and PSE). The chemical structures of the prepared compounds were confirmed by FT-IR and 1H NMR analysis. The critical micelle concentrations of the prepared cationic copolymeric surfactants were investigated. Also, the studies of petroleum-collecting and dispersing properties showed that copolymeric surfactants (PSE) have promised effects than PSM ones, especially in sea water and diluted form, and the best molar ratio that gave excellent dispersion of petroleum is PSM-3 and PSE-3. |
