Add time:09/27/2019         Source:sciencedirect.com

Radical copolymerizations of cationic, surface-active monomers, such as lauryl (C12Br), octyl (C8Br) and cetyl (C16Br) bromide salts of 2-dimethylaminoethyl methacrylate with methyl methacrylate (MMA) or styrene (ST) have been studied in water and N,N-dimethylformamide (DMF) as solvent, giving an anisotropic and an isotropic solution, respectively. For both comonomer systems, the copolymerizations of C12Br in water were faster and exhibited a higher tendency toward alternation compared to those in DMF. It was deduced that the copolymerization in water mainly takes place at palisade layers of micelles of the cationic monomer, being responsible for increased rate and alternation of the copolymerization. The Q and e values of C12Br were determined on the results of the copolymerization in DMF and both were found to be higher than those of 2-dimethylaminoethyl methacrylate (DMAEMA). Such higher Q and e values for the cationic monomer could be due to an intramolecular interaction of the oxygen atom of carbonyl group with the positively charged ammonium group.The copolymers of C12Br prepared here were characterized by solubility in water, solution viscosity and solubilization of azobenzene in the aqueous solution. Other micelle-forming monomers, C8Br and C16Br, were also used to study the effect of alkyl chain length on the copolymerization.

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