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Investigation of the segregative phase separation induced by addition of polystyrene to AOT oil-continuous microemulsions

Lynch, Iseult LU ; Cornen, Sophie LU and Piculell, Lennart LU (2004) In The Journal of Physical Chemistry Part B 108(17). p.5443-5452
Abstract
The effect of different molecular weight polystyrenes (PS) on the phase behavior of sodium 1,4-bis(2-ethylhexyl) sulfosuccinate (AOT)/water/cyclohexane oil-continuous microemulsions was investigated. The surfactant-covered water droplets were treated as a pseudocomponent in the mixture, and ternary polymer/droplet/oil phase diagrams were established as a function of microemulsion droplet radius (2.7 or 3.8 nm), PS molecular weight (18 700 45 730, and 700 000), and temperature. The different polymer radii of gyration (R,) and droplet radii (R-d) resulted in a broad range of size ratios (R-g/R-d = q) being accessible: 0.9 less than or equal to q less than or equal to 8.9. The aims of this work were to study polymer-particle segregation in... (More)
The effect of different molecular weight polystyrenes (PS) on the phase behavior of sodium 1,4-bis(2-ethylhexyl) sulfosuccinate (AOT)/water/cyclohexane oil-continuous microemulsions was investigated. The surfactant-covered water droplets were treated as a pseudocomponent in the mixture, and ternary polymer/droplet/oil phase diagrams were established as a function of microemulsion droplet radius (2.7 or 3.8 nm), PS molecular weight (18 700 45 730, and 700 000), and temperature. The different polymer radii of gyration (R,) and droplet radii (R-d) resulted in a broad range of size ratios (R-g/R-d = q) being accessible: 0.9 less than or equal to q less than or equal to 8.9. The aims of this work were to study polymer-particle segregation in this well-defined system, where both polymer size, particle size, and hence size ratio Could be controlled and where polymer-solvent interactions could be varied across the theta temperature, and to compare the fluid-fluid binodal phase diagrams with those predicted theoretically. It turns out that the polystyrene chains in AOT oil-continuous microemulsions behave almost as ideal chains, over all q values and temperatures investigated. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
108
issue
17
pages
5443 - 5452
publisher
The American Chemical Society
external identifiers
  • wos:000220997300045
  • scopus:2342469956
ISSN
1520-5207
DOI
10.1021/jp0493834
language
English
LU publication?
yes
id
06d2cf5f-8595-4009-93c3-627d8fe2f81c (old id 153943)
date added to LUP
2007-07-11 15:59:21
date last changed
2017-01-01 07:15:19
@article{06d2cf5f-8595-4009-93c3-627d8fe2f81c,
  abstract     = {The effect of different molecular weight polystyrenes (PS) on the phase behavior of sodium 1,4-bis(2-ethylhexyl) sulfosuccinate (AOT)/water/cyclohexane oil-continuous microemulsions was investigated. The surfactant-covered water droplets were treated as a pseudocomponent in the mixture, and ternary polymer/droplet/oil phase diagrams were established as a function of microemulsion droplet radius (2.7 or 3.8 nm), PS molecular weight (18 700 45 730, and 700 000), and temperature. The different polymer radii of gyration (R,) and droplet radii (R-d) resulted in a broad range of size ratios (R-g/R-d = q) being accessible: 0.9 less than or equal to q less than or equal to 8.9. The aims of this work were to study polymer-particle segregation in this well-defined system, where both polymer size, particle size, and hence size ratio Could be controlled and where polymer-solvent interactions could be varied across the theta temperature, and to compare the fluid-fluid binodal phase diagrams with those predicted theoretically. It turns out that the polystyrene chains in AOT oil-continuous microemulsions behave almost as ideal chains, over all q values and temperatures investigated.},
  author       = {Lynch, Iseult and Cornen, Sophie and Piculell, Lennart},
  issn         = {1520-5207},
  language     = {eng},
  number       = {17},
  pages        = {5443--5452},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Investigation of the segregative phase separation induced by addition of polystyrene to AOT oil-continuous microemulsions},
  url          = {http://dx.doi.org/10.1021/jp0493834},
  volume       = {108},
  year         = {2004},
}