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Characterization of a PEO-PPO-PEO block copolymer system

Schillén, Karin LU ; Glatter, Otto and Brown, Wyn (1993) In Progress in colloid and polymer science 93. p.66-71
Abstract
The investigated EO27-PO39-EO27 triblock copolymer, Pluronics P-85, is a nonionic surface-active agent which has a monomeric molecular weight of 4600, of which 500% corresponds to the PEO component. P-85 exist in complex states of aggregation in aqueous solution. Monomers, micelles and larger aggregates (clusters) coexist at lower concentrations in relative proportions which depend on temperature. The micelles are composed of a core of the water-insoluble PPO-block with a swollen shell of PEO-endblocks, having a hydrodynamic radius of 75 Å. The monomers have a hydrodynamic radius of 18 Å. At higher temperatures and concentrations, the micelles are close-packed in a body-cente-red-cubic (b.c.c.) liquid crystalline phase which is solid-like... (More)
The investigated EO27-PO39-EO27 triblock copolymer, Pluronics P-85, is a nonionic surface-active agent which has a monomeric molecular weight of 4600, of which 500% corresponds to the PEO component. P-85 exist in complex states of aggregation in aqueous solution. Monomers, micelles and larger aggregates (clusters) coexist at lower concentrations in relative proportions which depend on temperature. The micelles are composed of a core of the water-insoluble PPO-block with a swollen shell of PEO-endblocks, having a hydrodynamic radius of 75 Å. The monomers have a hydrodynamic radius of 18 Å. At higher temperatures and concentrations, the micelles are close-packed in a body-cente-red-cubic (b.c.c.) liquid crystalline phase which is solid-like and glass-clear. At even higher temperatures this gel of micelles “dissolves” again. For structural (internal) information on the monomer, the micelle, and to study the interacting micelles and the gel, small-angle x-ray-scattering measurements and dynamic light-scattering measurements have been made in the concentration range 1 to 25% (w/w) with the temperature range 5 to 70°C. The micellization was detected clearly by ultrasound velocimetry measurements. To characterize the viscosity of the gel (cubic phase) advanced densimetry was performed. (Less)
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author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Progress in colloid and polymer science
editor
P., Laggner; O., Glatter; and
volume
93
pages
66 - 71
publisher
Springer
external identifiers
  • scopus:0027750623
ISSN
0340-255X
DOI
10.1007/BFb0118476
language
English
LU publication?
no
id
6f970b4a-feaf-4076-a589-a15dce38a8a3 (old id 1736980)
date added to LUP
2010-12-14 16:54:57
date last changed
2017-07-23 04:42:35
@inproceedings{6f970b4a-feaf-4076-a589-a15dce38a8a3,
  abstract     = {The investigated EO27-PO39-EO27 triblock copolymer, Pluronics P-85, is a nonionic surface-active agent which has a monomeric molecular weight of 4600, of which 500% corresponds to the PEO component. P-85 exist in complex states of aggregation in aqueous solution. Monomers, micelles and larger aggregates (clusters) coexist at lower concentrations in relative proportions which depend on temperature. The micelles are composed of a core of the water-insoluble PPO-block with a swollen shell of PEO-endblocks, having a hydrodynamic radius of 75 Å. The monomers have a hydrodynamic radius of 18 Å. At higher temperatures and concentrations, the micelles are close-packed in a body-cente-red-cubic (b.c.c.) liquid crystalline phase which is solid-like and glass-clear. At even higher temperatures this gel of micelles “dissolves” again. For structural (internal) information on the monomer, the micelle, and to study the interacting micelles and the gel, small-angle x-ray-scattering measurements and dynamic light-scattering measurements have been made in the concentration range 1 to 25% (w/w) with the temperature range 5 to 70°C. The micellization was detected clearly by ultrasound velocimetry measurements. To characterize the viscosity of the gel (cubic phase) advanced densimetry was performed.},
  author       = {Schillén, Karin and Glatter, Otto and Brown, Wyn},
  booktitle    = {Progress in colloid and polymer science},
  editor       = {P., Laggner and O., Glatter},
  issn         = {0340-255X},
  language     = {eng},
  pages        = {66--71},
  publisher    = {Springer},
  title        = {Characterization of a PEO-PPO-PEO block copolymer system},
  url          = {http://dx.doi.org/10.1007/BFb0118476},
  volume       = {93},
  year         = {1993},
}