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Phase Behavior in Aqueous Two-Phase Systems Containing

Svensson, Mårten; Linse, Per LU and Tjerneld, Folke LU (1995) In Macromolecules 28(10). p.3597-3603
Abstract
The phase behavior of the three-component PEO-PPO-PEO/dextradwater system has

been studied. Pluronic L64, P105, and F68 were used, and they are members of a family of triblock

copolymers with the structure PEO-PPO-PEO, where PEO is poly(ethy1ene oxide) and PPO poly-

(propylene oxide). Moreover, these triblock copolymers tend to self-aggregate in aqueous solution at

increasing temperature. The phase behavior of the three-component system was studied both experi-

mentally and theoretically at different temperatures corresponding to the unimer (monomolecular) and

the micellar region of the PEO-PPO-PEO polymers. The determination of the unimer and micellar

regions was performed... (More)
The phase behavior of the three-component PEO-PPO-PEO/dextradwater system has

been studied. Pluronic L64, P105, and F68 were used, and they are members of a family of triblock

copolymers with the structure PEO-PPO-PEO, where PEO is poly(ethy1ene oxide) and PPO poly-

(propylene oxide). Moreover, these triblock copolymers tend to self-aggregate in aqueous solution at

increasing temperature. The phase behavior of the three-component system was studied both experi-

mentally and theoretically at different temperatures corresponding to the unimer (monomolecular) and

the micellar region of the PEO-PPO-PEO polymers. The determination of the unimer and micellar

regions was performed with a dye solubilization technique using 1,6-diphenyl-1,3,5-hexatriene (DPH) as

a spectroscopic probe. A strong temperature effect on the phase behavior in PEO-PPO-PEO/dextrad

water systems was observed in the case of Pluronic L64 and P105. At elevated temperature (40 "C) the

micellization of the PEO-PPO-PEO polymers leads to a drastic change of the tie-line slopes as well as

the shape of the binodals. Qualitative agreements were found between experimental findings and

theoretical calculations using a Flory-Huggins lattice theory extended with internal degrees of freedom

by modeling the PEO-PPO-PEO polymers as a poly(ethy1ene oxide) chain. This supports the prevailing

picture that the more hydrophobic PPO block is shielded from water contacts by forming hydrophobic

domains surrounded by EO segments. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
OXIDE) TRIBLOCK COPOLYMER, OXYPROPYLENE OXYETHYLENE), LIGHT-SCATTERING, PROPYLENE-OXIDE, ETHYLENE-OXIDE, MICELLIZATION, SOLUBILIZATION, ASSOCIATION, PROBE
in
Macromolecules
volume
28
issue
10
pages
3597 - 3603
publisher
The American Chemical Society
external identifiers
  • scopus:0001240339
ISSN
0024-9297
DOI
10.1021/ma00114a012
language
English
LU publication?
yes
id
be81ee32-4071-47b3-910f-419a6a9a012e (old id 126530)
date added to LUP
2007-07-06 17:06:07
date last changed
2017-01-01 05:17:51
@article{be81ee32-4071-47b3-910f-419a6a9a012e,
  abstract     = {The phase behavior of the three-component PEO-PPO-PEO/dextradwater system has<br/><br>
been studied. Pluronic L64, P105, and F68 were used, and they are members of a family of triblock<br/><br>
copolymers with the structure PEO-PPO-PEO, where PEO is poly(ethy1ene oxide) and PPO poly-<br/><br>
(propylene oxide). Moreover, these triblock copolymers tend to self-aggregate in aqueous solution at<br/><br>
increasing temperature. The phase behavior of the three-component system was studied both experi-<br/><br>
mentally and theoretically at different temperatures corresponding to the unimer (monomolecular) and<br/><br>
the micellar region of the PEO-PPO-PEO polymers. The determination of the unimer and micellar<br/><br>
regions was performed with a dye solubilization technique using 1,6-diphenyl-1,3,5-hexatriene (DPH) as<br/><br>
a spectroscopic probe. A strong temperature effect on the phase behavior in PEO-PPO-PEO/dextrad<br/><br>
water systems was observed in the case of Pluronic L64 and P105. At elevated temperature (40 "C) the<br/><br>
micellization of the PEO-PPO-PEO polymers leads to a drastic change of the tie-line slopes as well as<br/><br>
the shape of the binodals. Qualitative agreements were found between experimental findings and<br/><br>
theoretical calculations using a Flory-Huggins lattice theory extended with internal degrees of freedom<br/><br>
by modeling the PEO-PPO-PEO polymers as a poly(ethy1ene oxide) chain. This supports the prevailing<br/><br>
picture that the more hydrophobic PPO block is shielded from water contacts by forming hydrophobic<br/><br>
domains surrounded by EO segments.},
  author       = {Svensson, Mårten and Linse, Per and Tjerneld, Folke},
  issn         = {0024-9297},
  keyword      = {OXIDE) TRIBLOCK COPOLYMER,OXYPROPYLENE OXYETHYLENE),LIGHT-SCATTERING,PROPYLENE-OXIDE,ETHYLENE-OXIDE,MICELLIZATION,SOLUBILIZATION,ASSOCIATION,PROBE},
  language     = {eng},
  number       = {10},
  pages        = {3597--3603},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Phase Behavior in Aqueous Two-Phase Systems Containing},
  url          = {http://dx.doi.org/10.1021/ma00114a012},
  volume       = {28},
  year         = {1995},
}