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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)
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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 (ACS)
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
2016-04-01 12:36:39
date last changed
2025-04-04 14:13:58
@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}},
  keywords     = {{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 (ACS)}},
  series       = {{Macromolecules}},
  title        = {{Phase Behavior in Aqueous Two-Phase Systems Containing}},
  url          = {{http://dx.doi.org/10.1021/ma00114a012}},
  doi          = {{10.1021/ma00114a012}},
  volume       = {{28}},
  year         = {{1995}},
}