WATER-SOLUBLE COPOLYMERS BASED ON ACRYLAMIDE AND ACRYLAMIDOACIDS WITH DRAG REDUCTION PROPERTIES

摘要

Synthesis of acryloyl amino acid monomers, some of them were optically active, has been carried out. They have been copolymerized with acrylamide and characterized. The microstructure of these macromolecules has been studied through reactivity ratios determination. The optical rotation and the viscosity of these compounds were also assessed. The molecular weight was calculated with light scattering measures. The macromolecules prepared from optically active monomers present a compact structure in solution. The copolymers were tested with a new system, designed in our laboratory, in order to determine the hydrodynamic friction under turbulent conditions. It was observed for this range of copolymers a particular persistent activity similar to natural products behavior and different from the drag reduction activity of PEO and PAM. It was shown that the particular structure induced by the chiral monomers, that means the global organization or local organization of the main chain of the copolymer, is not responsible for this persistence. In contrast, the branch chain and the side chain contribute to this property.