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Particle-induced phase separation in quasi-binary polymer solutions

Olsson, Martin LU ; Joabsson, Fredrik and Piculell, Lennart LU (2004) In Langmuir 20(5). p.1605-1610
Abstract
A long-ranged attractive force was recently detected between two mica plates immersed in a quasibinary polymer solution (Freyssingeas et al. Langmuir 1998,14, 5877-5889). The quasi-binary polymer solution was aqueous ethyl(hydroxyethyl)cellulose (EHEC), where the EHEC had a broad polydispersity. The long-ranged attractive force in the EHEC solution could not be attributed to classical mechanisms such as depletion or bridging. In this study, we investigated if this attractive force can give rise to instability effects in mixed polymer-particle solutions. Accordingly, the effects of added particles on the phase behavior of aqueous EHEC solutions were investigated by cloud point measurements. Aqueous EHEC solutions phase separate on heating.... (More)
A long-ranged attractive force was recently detected between two mica plates immersed in a quasibinary polymer solution (Freyssingeas et al. Langmuir 1998,14, 5877-5889). The quasi-binary polymer solution was aqueous ethyl(hydroxyethyl)cellulose (EHEC), where the EHEC had a broad polydispersity. The long-ranged attractive force in the EHEC solution could not be attributed to classical mechanisms such as depletion or bridging. In this study, we investigated if this attractive force can give rise to instability effects in mixed polymer-particle solutions. Accordingly, the effects of added particles on the phase behavior of aqueous EHEC solutions were investigated by cloud point measurements. Aqueous EHEC solutions phase separate on heating. Three different samples of EHEC were investigated, including hydrophobically modified EHEC. As colloidal particles, silica and polystyrene latex were used. The dispersed colloidal particles lowered the cloud point temperature at low polymer concentrations for all EHEC-particle combinations. This particle-induced phase separation is discussed in terms of surface effects. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
20
issue
5
pages
1605 - 1610
publisher
The American Chemical Society
external identifiers
  • wos:000189241500012
  • scopus:1542375077
ISSN
0743-7463
DOI
10.1021/la035929m
language
English
LU publication?
yes
id
25fb6a68-ddf2-4c47-af6c-3e536a00349e (old id 153807)
date added to LUP
2007-07-12 09:05:02
date last changed
2017-10-01 03:51:11
@article{25fb6a68-ddf2-4c47-af6c-3e536a00349e,
  abstract     = {A long-ranged attractive force was recently detected between two mica plates immersed in a quasibinary polymer solution (Freyssingeas et al. Langmuir 1998,14, 5877-5889). The quasi-binary polymer solution was aqueous ethyl(hydroxyethyl)cellulose (EHEC), where the EHEC had a broad polydispersity. The long-ranged attractive force in the EHEC solution could not be attributed to classical mechanisms such as depletion or bridging. In this study, we investigated if this attractive force can give rise to instability effects in mixed polymer-particle solutions. Accordingly, the effects of added particles on the phase behavior of aqueous EHEC solutions were investigated by cloud point measurements. Aqueous EHEC solutions phase separate on heating. Three different samples of EHEC were investigated, including hydrophobically modified EHEC. As colloidal particles, silica and polystyrene latex were used. The dispersed colloidal particles lowered the cloud point temperature at low polymer concentrations for all EHEC-particle combinations. This particle-induced phase separation is discussed in terms of surface effects.},
  author       = {Olsson, Martin and Joabsson, Fredrik and Piculell, Lennart},
  issn         = {0743-7463},
  language     = {eng},
  number       = {5},
  pages        = {1605--1610},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Particle-induced phase separation in quasi-binary polymer solutions},
  url          = {http://dx.doi.org/10.1021/la035929m},
  volume       = {20},
  year         = {2004},
}