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Effect of Hydrophobic Modification on Phase Behaviour and Rheology in Mixtures of Oppositely Charged Polyelectrolytes

Thuresson, Krister LU ; Nilsson, Svante and Lindman, Björn (1996) In Langmuir 12(2). p.530-537
Abstract
Phase behavior and rheology of polymer mixtures comprising aqueous solutions of oppositely charged polyelectrolytes are investigated. Emphasis is put on the effects of hydrophobic modification of the polymers and addition of salt. The associative phase separation usually observed when mixing oppositely charged polyelectrolytes is effectively prevented over a large miscibility region for the hydrophobically modified polymers. Also, in the extended one-phase region, the viscosity is 3-4 orders of magnitude higher for mixed polyelectrolyte systems compared to that observed for either one of the polymers. Addition of ordinary electrolytes to the mixture decreases the viscosity strongly, and at higher electrolyte contents a phase separation is... (More)
Phase behavior and rheology of polymer mixtures comprising aqueous solutions of oppositely charged polyelectrolytes are investigated. Emphasis is put on the effects of hydrophobic modification of the polymers and addition of salt. The associative phase separation usually observed when mixing oppositely charged polyelectrolytes is effectively prevented over a large miscibility region for the hydrophobically modified polymers. Also, in the extended one-phase region, the viscosity is 3-4 orders of magnitude higher for mixed polyelectrolyte systems compared to that observed for either one of the polymers. Addition of ordinary electrolytes to the mixture decreases the viscosity strongly, and at higher electrolyte contents a phase separation is induced. A mechanism explaining the observations is proposed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
12
issue
2
pages
530 - 537
publisher
The American Chemical Society
ISSN
0743-7463
language
English
LU publication?
yes
id
b52bb70d-b2d8-4524-a10d-23020f6aae1e (old id 30856)
date added to LUP
2007-06-19 14:36:35
date last changed
2016-04-15 20:44:11
@article{b52bb70d-b2d8-4524-a10d-23020f6aae1e,
  abstract     = {Phase behavior and rheology of polymer mixtures comprising aqueous solutions of oppositely charged polyelectrolytes are investigated. Emphasis is put on the effects of hydrophobic modification of the polymers and addition of salt. The associative phase separation usually observed when mixing oppositely charged polyelectrolytes is effectively prevented over a large miscibility region for the hydrophobically modified polymers. Also, in the extended one-phase region, the viscosity is 3-4 orders of magnitude higher for mixed polyelectrolyte systems compared to that observed for either one of the polymers. Addition of ordinary electrolytes to the mixture decreases the viscosity strongly, and at higher electrolyte contents a phase separation is induced. A mechanism explaining the observations is proposed.},
  author       = {Thuresson, Krister and Nilsson, Svante and Lindman, Björn},
  issn         = {0743-7463},
  language     = {eng},
  number       = {2},
  pages        = {530--537},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Effect of Hydrophobic Modification on Phase Behaviour and Rheology in Mixtures of Oppositely Charged Polyelectrolytes},
  volume       = {12},
  year         = {1996},
}