Aggregation of block-copolymers in aqueous solutions: Thermodynamics, structure 
and dynamics

Holzwarth, Josef F.; Couderc-Azouani, Sabine

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Aggregation of block-copolymers in aqueous solutions: Thermodynamics, structure and dynamics

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Holzwarth, Josef F.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Couderc-Azouani, Sabine
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Holzwarth, J. F., & Couderc-Azouani, S. (2003). Aggregation of block-copolymers in aqueous solutions: Thermodynamics, structure and dynamics. In B. H. Robinson (Ed.), Self-Assembly (pp. 239-250). Amsterdam, The Netherlands: IOS Press.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-1246-B

Abstract

We investigated the thermodynamic and dynamic behavior of triblock copolymers of the general structure poly-ethylene oxide - poly-propylene oxide - poly-ethylene oxide (PEO-PPO-PEO) in water. Two representative examples were chosen, L64, (EO)13-(PO)30-(EO)13 and F127, (EO)97-(PO)69-(EO)97. The critical micellization temperature (CMT), the enthalpy of micellization (Delta)Hmic and aggregation numbers of 35 to 60 could be determined. The kinetics were characterized by three well defined relaxation processes via iodine-laser temperature-jump and stopped flow. Monomer insertion in the microsecond time range is followed by a size readjustment and finally micellar growth was observed when macroscopic phase separation was approached. Small angle neutron scattering showed aggregates with wet cores of PPO and coronas of fully hydrated PEO. The influence of added surfactants could also be monitored and interactions below and above the CMT of the triblock copolymers were observed, showing synergistic effects. An outlook into future experiments closes the contribution.