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Updated: May 11, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
Published on: October 10, 2016
A thermosensitive carrageenan-based polymer: synthesis, characterization and interactions with a cationic surfactant
Kamila Gaweł1, Anna Karewicz, Dorota Bielska
1Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Ingardena 3, Poland.
Novel polymers synthesized by grafting N-isopropylacrylamide onto ι-carrageenan exhibit tunable lower critical solution temperatures. These polyelectrolytes interact with cationic surfactants, forming aggregates at lower concentrations and influencing aggregation behavior with salt.
Area of Science:
- Polymer Chemistry
- Materials Science
- Physical Chemistry
Background:
- Novel polyelectrolytes offer tunable properties for various applications.
- Understanding polymer-surfactant interactions is crucial for materials design.
Purpose of the Study:
- To synthesize and characterize novel ι-carrageenan-graft-N-isopropylacrylamide (CAR-graft-PNIPAM) copolymers.
- To investigate the lower critical solution temperature (LCST) behavior of these polymers.
- To study the interaction of CAR-graft-PNIPAM with dodecyltrimethyl ammonium chloride (DTAC) cationic surfactant.
Main Methods:
- Graft copolymerization of N-isopropylacrylamide onto ι-carrageenan.
- Synthesis of polymers with varying grafting degrees.
- Determination of LCST in aqueous solutions.
- Investigation of polymer-surfactant interactions using critical aggregation concentration (cac) measurements.
- Thermodynamic analysis of complexation.
Main Results:
- Synthesized CAR-graft-PNIPAM polymers displayed LCST behavior near that of poly(N-isopropylacrylamide).
- LCST was influenced by salt concentration and cationic surfactant presence.
- CAR-graft-PNIPAM significantly lowered the cac of DTAC, inducing earlier aggregate formation.
- Surfactant aggregation behavior differed between modified and unmodified ι-carrageenan.
Conclusions:
- CAR-graft-PNIPAM copolymers exhibit tunable thermoresponsive behavior.
- The presence of grafted PNIPAM chains alters ι-carrageenan's interaction with cationic surfactants.
- These findings provide insights into designing functional polyelectrolyte-surfactant systems.
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