The aggregation of branched polyethylenimine and cationic surfactants in aqueous systems |
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| Authors: | E M Kosacheva D B Kudryavtsev R F Bakeeva A I Kuklin A Kh Islamov L A Kudryavtseva V F Sopin A I Konovalov |
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| Institution: | (1) Arbuzov Institute of Organic and Physical Chemistry, Kazan Research Center, Russian Academy of Sciences, ul. Akademika Arbuzova 8, Kazan, 420088, Tatarstan, Russia;(2) Kazan State Technological University, ul. K. Marksa 68, Kazan, 420014, Tatarstan, Russia;(3) Joint Institute for Nuclear Research, ul. Joliot-Curie 6, Dubna, 141980, Russia |
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| Abstract: | The aggregation of binary mixtures of branched polyethylenimine with a molecular mass of 30 000 and cationic surfactants, such as cetyltrimethylammonium bromide, cetyldimethylethylammonium bromide, or cetyldimethyl(2-hydroxyethyl)ammonium bromide, in aqueous solutions is studied. The critical micellization concentrations, as well as the sizes and shapes of aggregates, are determined by conductometry, small-angle neutron scattering, and dynamic light scattering methods. Catalytic activity of cationic surfactant-polyethylenimine compositions in the hydrolysis of tetracoordinated phosphorus acid 4-nitrophenyl esters is studied via spectrophotometry. The influence of spatial characteristics of aggregates on the catalytic activity and selectivity of nanostructured polymeric systems is revealed. |
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