Temperature-Induced Growth of Wormlike Copolymer Micelles

Temperature-Induced Growth of Wormlike Copolymer Micelles

We study the temperature-induced growth of polymer micelles based on Pluronic P84 in brine (2 M NaCl) using small-angle neutron scattering, static and dynamic light scattering, and viscometry as a function of temperature and polymer concentration. Spherical micelles below 30 °C are shown to grow bet...

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Veröffentlicht in:Langmuir 2005-05, Vol.21 (11), p.4904-4911
Hauptverfasser: Duval, M, Waton, G, Schosseler, F
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Chemistry
Exact sciences and technology
General and physical chemistry
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Waton, G
Schosseler, F
description We study the temperature-induced growth of polymer micelles based on Pluronic P84 in brine (2 M NaCl) using small-angle neutron scattering, static and dynamic light scattering, and viscometry as a function of temperature and polymer concentration. Spherical micelles below 30 °C are shown to grow between about 30 and 40 °C into wormlike micelles long enough to enter the semidilute regime for polymer volume fraction larger than 0.005. The entanglements in this regime are responsible for a huge increase in the viscosity. Above about 41 °C, the micellar aggregates become denser as the cloud point is approached and the viscosity drops.
doi_str_mv 10.1021/la050177c
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General and physical chemistry
title Temperature-Induced Growth of Wormlike Copolymer Micelles
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