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

Research output: Contribution to journalArticle


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.


  • Krister Thuresson
  • Svante Nilsson
  • Björn Lindman
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)530-537
Issue number2
Publication statusPublished - 1996
Publication categoryResearch

Related research output

Thuresson, K., 1996, Physical Chemistry 1, Lund University. 35 p.

Research output: ThesisDoctoral Thesis (compilation)

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