Polyelectrolyte and non-polyelectrolyte polyacrylamide copolymer solutions: the role of salt on the intra- and intermolecular interactions
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.
Main Authors: | Maia,Ana M. S., Villetti,Marcos A., Borsali,Redouane, Balaban,Rosangela C. |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Sociedade Brasileira de Química
2013
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532013001100020 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Solution properties of a hydrophobically associating polyacrylamide and its polyelectrolyte derivatives determined by light scattering, small angle x-ray scattering and viscometry
by: Maia,Ana M. S, et al.
Published: (2011) -
INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
by: RÍOS,HERNÁN E, et al.
Published: (2016) -
Polyelectrolyte solutions : a theoretical introduction /
by: Rice, Stuart A. 25575, et al.
Published: (1961) -
Properties of Polyelectrolyte Solutions as Determined by the Charge of Counterions
by: Hribar,Barbara, et al.
Published: (2000) -
ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
by: BARRAZA,RAUL G., et al.
Published: (2003)