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A thermosensitive carrageenan-based polymer: Synthesis, characterization and interactions with a cationic surfactant

Authors
Journal
Carbohydrate Polymers
0144-8617
Publisher
Elsevier
Publication Date
Volume
96
Issue
1
Identifiers
DOI: 10.1016/j.carbpol.2013.03.056
Keywords
  • Surfactants
  • Polysaccharides
  • Biopolymers
  • Polyelectrolytes
  • Carrageenan
  • Stimuli-Sensitive Polymers

Abstract

Abstract Novel polyelectrolytes were obtained by grafting N-isopropylacrylamide (NIPAM) on the ι-carrageenan (CAR) chain. Two polymers with different grafting degrees were synthesized. The polymers were found to show the lower critical solution temperature (LCST) close to that of PNIPAM. The LCST values were dependent on the concentration of salt and cationic surfactant. The interactions of CAR-graft-PNIPAM with a model cationic surfactant-dodecyltrimethyl ammonium chloride (DTAC) in water and 0.15M NaCl were studied. It was found that both ι-carrageenan and CAR-graft-PNIPAM polymers interact with DTAC. The presence of CAR-graft-PNIPAM in the solution of DTAC induces formation of surfactant aggregates at the critical aggregation concentration much lower than the cmc of the surfactant. Cac increased with ionic strength. The values of cac for CAR-graft-PNIPAM – DTAC system and standard free enthalpy changes attributed to the complexation process were determined. The results obtained for CAR-graft-PNIPAM were compared with these for the non-modified ι-carrageenan. The surfactant interactions with non-modified and grafted polymers were found to be different in nature.

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