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Aggregation and solubilization of organic solvents and petrol/gasoline in water mediated by block copolymers
Authors:Alexandra Muñoz-Bonilla  Marta Fernández-García  Giuseppe Mantovani
Institution:a Department of Chemistry, University of Warwick, Coventry CV4 7L, UK
b CSIC, Instituto de Ciencia y Tecnología de Polímeros, C/Juan de la Cierva 3, 28006 Madrid, Spaín
Abstract:A series of AB and ABA block copolymers of pDEGMEMA-b-pCHMA and pCHMA-b-pDEGMEMA-b-pCHMA cyclohexyl methacrylate (CHMA) and di(ethylene glycol) methyl ether methacrylate (DEGMEMA) with Mn ranging between 18,000 and 50,000 g mol−1 and PDI = 1.09-1.32 were prepared via copper(I) mediated living radical polymerization with pyridylmethanimine ligands. Aggregation properties were investigated using a combination of 1H NMR, dynamic and static light scattering. For comparative purposes poly(CHMA) and poly(DEGMEMA) homopolymers were prepared. The CAC values estimated for the di- and triblock copolymers soluble in cyclohexane are lower than 0.005 g L−1 whereas the values found for block copolymers in methanol solutions are less than 0.070 g L−1. DLS analysis showed the presence of micellar aggregates with diameters ranging from 25 to 40 nm with particle polydispersity indexes between 0.003 and 0.183. The pCHMA-b-pDEGMEMA-b-pCHMA micelles solubilized the aqueous phase in petrol/gasoline. The block copolymer-based micelles incorporate water within their hydrophilic domains, potentially overcoming a number of practical problems such as the formation of biphasic mixtures in solvent blends due to undesired water accumulation.
Keywords:Living radical polymerization  ATRP  Block copolymer  Gasoline
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