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Phase Separation Phenomena and Viscosity Enhancements in

Bergfeldt, K; Piculell, Lennart LU and Tjerneld, Folke LU (1995) In Macromolecules 28(9). p.3360-3370
Abstract
Interactions between poly(styrenesu1fonate) (PSS) and poly(acry1ic acid) (PA) in aqueous

solution have been studied, with and without added salt, and at various degrees of neutralization (a) of

PA. Equilibrium phase diagrams have been determined, and the viscosities of monophasic mixtures

have been measured. Both types of experiments reveal striking effects of a on the PA-PSS interactions.

Salt-free mixtures with fully or partially neutralized poly(acry1ic acid) phase separate segregatively, except

at very low a where, instead, an association between PA and PSS occurs. The association is evidenced

by a dramatically increased viscosity, relative to solutions of PA or PSS alone, in... (More)
Interactions between poly(styrenesu1fonate) (PSS) and poly(acry1ic acid) (PA) in aqueous

solution have been studied, with and without added salt, and at various degrees of neutralization (a) of

PA. Equilibrium phase diagrams have been determined, and the viscosities of monophasic mixtures

have been measured. Both types of experiments reveal striking effects of a on the PA-PSS interactions.

Salt-free mixtures with fully or partially neutralized poly(acry1ic acid) phase separate segregatively, except

at very low a where, instead, an association between PA and PSS occurs. The association is evidenced

by a dramatically increased viscosity, relative to solutions of PA or PSS alone, in semidilute mixtures.

Addition of salt (1 M NaC1) results in an increased two-phase area at all a, and in the appearance of an

associative phase separation for non-neutralized PA. The qualitative phase behavior observed in the

presence of salt can be generated by calculations using the Flory-Huggins theory, if it is assumed that

both the PSS-PA and the PA-solvent interactions change monotonically with a in a specified fashion.

All experimental observations, and the theoretical modeling, suggest that the effective PA-PSS interaction

changes (over a narrow interval of a) from an attraction at very low a to a repulsion at higher a. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Polymer compatibility, Ternary-systems, Complexes, Solvent, Salt, Surfactant, Polyelectrolyte
in
Macromolecules
volume
28
issue
9
pages
3360 - 3370
publisher
The American Chemical Society
external identifiers
  • scopus:0000188398
ISSN
0024-9297
DOI
10.1021/ma00113a041
language
English
LU publication?
yes
id
77758466-66a8-404d-8bd6-7ceeaa9d9072 (old id 126535)
date added to LUP
2007-07-04 10:46:49
date last changed
2017-09-24 03:30:38
@article{77758466-66a8-404d-8bd6-7ceeaa9d9072,
  abstract     = {Interactions between poly(styrenesu1fonate) (PSS) and poly(acry1ic acid) (PA) in aqueous<br/><br>
solution have been studied, with and without added salt, and at various degrees of neutralization (a) of<br/><br>
PA. Equilibrium phase diagrams have been determined, and the viscosities of monophasic mixtures<br/><br>
have been measured. Both types of experiments reveal striking effects of a on the PA-PSS interactions.<br/><br>
Salt-free mixtures with fully or partially neutralized poly(acry1ic acid) phase separate segregatively, except<br/><br>
at very low a where, instead, an association between PA and PSS occurs. The association is evidenced<br/><br>
by a dramatically increased viscosity, relative to solutions of PA or PSS alone, in semidilute mixtures.<br/><br>
Addition of salt (1 M NaC1) results in an increased two-phase area at all a, and in the appearance of an<br/><br>
associative phase separation for non-neutralized PA. The qualitative phase behavior observed in the<br/><br>
presence of salt can be generated by calculations using the Flory-Huggins theory, if it is assumed that<br/><br>
both the PSS-PA and the PA-solvent interactions change monotonically with a in a specified fashion.<br/><br>
All experimental observations, and the theoretical modeling, suggest that the effective PA-PSS interaction<br/><br>
changes (over a narrow interval of a) from an attraction at very low a to a repulsion at higher a.},
  author       = {Bergfeldt, K and Piculell, Lennart and Tjerneld, Folke},
  issn         = {0024-9297},
  keyword      = {Polymer compatibility,Ternary-systems,Complexes,Solvent,Salt,Surfactant,Polyelectrolyte},
  language     = {eng},
  number       = {9},
  pages        = {3360--3370},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Phase Separation Phenomena and Viscosity Enhancements in},
  url          = {http://dx.doi.org/10.1021/ma00113a041},
  volume       = {28},
  year         = {1995},
}