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

Research output: Contribution to journalArticle

Standard

Effect of Hydrophobic Modification on Phase Behaviour and Rheology in Mixtures of Oppositely Charged Polyelectrolytes. / Thuresson, Krister; Nilsson, Svante; Lindman, Björn.

In: Langmuir, Vol. 12, No. 2, 1996, p. 530-537.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

Thuresson, Krister ; Nilsson, Svante ; Lindman, Björn. / Effect of Hydrophobic Modification on Phase Behaviour and Rheology in Mixtures of Oppositely Charged Polyelectrolytes. In: Langmuir. 1996 ; Vol. 12, No. 2. pp. 530-537.

RIS

TY - JOUR

T1 - Effect of Hydrophobic Modification on Phase Behaviour and Rheology in Mixtures of Oppositely Charged Polyelectrolytes

AU - Thuresson, Krister

AU - Nilsson, Svante

AU - Lindman, Björn

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

M3 - Article

VL - 12

SP - 530

EP - 537

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 2

ER -