Novel copolymers showing interactions of amidinium-carboxylate groups in water.

Four hydrophobic amidine containing monomers N-(pyridin-2-yl)methacrylamide ( 3) , 5-(pyridin-2-ylamino)pentyl methacrylate ( 7), S-5-(isopropenylcarbonyloxy)pentyl-N,N-diphenylthiourea ( 9) and methyl-5-guanidino-2-methacrylamidopentanoate ( 12) were synthesized and copolymerized with a water soluble co-monomer N,N-dimethylacrylamide ( 13) or N-isopropylacrylamide ( 22). The second component was a copolymer containing methacrylic acid ( 19) and 13/22. By combination of these two components the formation of amidinium-carboxylate interactions was determined by dynamic light scattering (DLS), H-NMR spectroscopy and rheology measurements. [ABSTRACT FROM AUTHOR]