Solution properties of a hydrophobically associating polyacrylamide and its polyelectrolyte derivatives determined by light scattering, small angle x-ray scattering and viscometry

Journal of the Brazilian Chemical Society

Ana M. S Maia²  Marcos A Villetti¹  Rosangela R. L Vidal²  Redouane Borsali¹  Rosangela C Balaban² 

[1] ,Universidade Federal do Rio Grande do Norte Departamento de Química LAPETNatal RN ,Brazil

关键词: hydrophobically-modified polyacrylamide;    partially hydrolyzed polyacrylamide;    DLS;    SLS;    SAXS;    rheology;   

DOI  :  10.1590/S0103-50532011000300012

来源: SciELO

【 摘 要 】

A hydrophobically-modified polyacrylamide and two partially hydrolyzed derivatives containing hydrophobic and carboxylic groups were prepared by micellar polymerization and post-hydrolysis. The molecular weight, second virial coefficient and radius of gyration were determined by static light scattering (SLS). Dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS) were employed to determine the aggregate formation and type of chain packing in the semidilute regime, respectively. The behavior of solutions in dilute and semidilute regimes was also studied by viscometry and rheology. The hydrophobically-modified polyacrylamide showed a tendency to form aggregates due to the hydrophobic groups, but not enough to increase apparent viscosity. The partially hydrolyzed derivatives did not show the same aggregate-forming tendency. Rather, they exhibited anisotropic behavior, due to the charge density introduced into the polymer chain, which led to a more elongated macromolecular conformation and higher viscosity.

【 授权许可】

CC BY   
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