Abstract
Poly(acrylamide-co-dihexylacrylamide) (PAHM-0) and poly(acrylamide-co-sodium acrylate-co-dihexylacrylamide) (PAHM-21) were studied through small-angle X-ray scattering (SAXS), light scattering (LS) and rheology. SAXS results highlighted the polyelectrolyte character of PAHM-21, with highly extended conformation in aqueous solution owing to charge repulsion, while the PAHM-0 has a coil conformation. LS measurements indicated that PAHM-0 makes intermolecular clusters in solution, in presence and absence of salt, even with a lower hydrophobic content than that described in the literature to the associative polyacrylamides. However, the rheological results showed that there is not an enhancement of the viscosity although hydrophobic association takes place. LS results for PAHM-21 suggest that this polymer makes intramolecular associations mainly in the presence of salts. Furthermore, the viscosity measurements show that its viscosity decreases due to screening of the charges by the addition of salts.
Highlights
Hydrophobically-associating acrylamide-based copolymers with a small number of hydrophobic groups have been extensively studied in previous decades.[1,2,3,4] WhenPolyelectrolyte and Non-Polyelectrolyte Polyacrylamide Copolymer SolutionsJ
The polyelectrolyte character of PAHM-21 was investigated through small-angle X-ray scattering (SAXS) in the semi dilute regime
The results show that the position of the wavevector at maximum scattering intensity qmax is shifted towards higher scattering vector values with the increase in the polymer concentration
Summary
Hydrophobically-associating acrylamide-based copolymers with a small number of hydrophobic groups have been extensively studied in previous decades.[1,2,3,4] WhenPolyelectrolyte and Non-Polyelectrolyte Polyacrylamide Copolymer SolutionsJ. Hydrophobically-associating acrylamide-based copolymers with a small number of hydrophobic groups have been extensively studied in previous decades.[1,2,3,4] When. Viscosity.[1,5] The hydrophobic monomers are mainly derivatives of acrylamide, acrylic esters and their derivatives.[6] For some copolymers, the viscosity at low polymer concentration is not high enough for applications such as oil recovery.[7,8]
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