Phase Separation Phenomena and Viscosity Enhancements in
(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:
https://lup.lub.lu.se/record/126535
- author
- Bergfeldt, K ; Piculell, Lennart LU and Tjerneld, Folke LU
- organization
- publishing date
- 1995
- 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 (ACS)
- 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
- 2016-04-01 11:43:38
- date last changed
- 2021-06-06 04:41:40
@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}},
keywords = {{Polymer compatibility; Ternary-systems; Complexes; Solvent; Salt; Surfactant; Polyelectrolyte}},
language = {{eng}},
number = {{9}},
pages = {{3360--3370}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Macromolecules}},
title = {{Phase Separation Phenomena and Viscosity Enhancements in}},
url = {{http://dx.doi.org/10.1021/ma00113a041}},
doi = {{10.1021/ma00113a041}},
volume = {{28}},
year = {{1995}},
}