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Size characterization of a charged amphiphilic copolymer in solutions of different salts and salt concentrations using flow field-flow

Wittgren, Bengt; Wahlund, Karl-Gustav LU ; Dérand, Helene and Wesslén, Bengt LU (1996) In Langmuir 12(25). p.5999-6005
Abstract
The aggregation behavior of a charged amphiphilic graft copolymer, prepared from poly(styrene-co-methyl methacrylate-co-maleic anhydride) and poly(ethylene oxide) monomethyl ether, was studied using flow field-flow fractionation (flow FFF). This method determines the hydrodynamic size of aggregates. The polymer was shown to have a complex aggregation behavior in aqueous solutions containing salt. This was expressed in the formation of differently sized structures, from single polymer chains to large polymolecular aggregates. The polymer changed its aggregation ability in the presence of different salts and salt concentrations, as reflected by changes in hydrodynamic size. Three different salts were tested: potassium chloride, sodium... (More)
The aggregation behavior of a charged amphiphilic graft copolymer, prepared from poly(styrene-co-methyl methacrylate-co-maleic anhydride) and poly(ethylene oxide) monomethyl ether, was studied using flow field-flow fractionation (flow FFF). This method determines the hydrodynamic size of aggregates. The polymer was shown to have a complex aggregation behavior in aqueous solutions containing salt. This was expressed in the formation of differently sized structures, from single polymer chains to large polymolecular aggregates. The polymer changed its aggregation ability in the presence of different salts and salt concentrations, as reflected by changes in hydrodynamic size. Three different salts were tested: potassium chloride, sodium sulfate, and sodium phosphate. Even at micromolar concentrations of sodium sulfate, a pronounced aggregation was observed, probably due to reduced charge repulsion. At higher concentrations of the ''salting-out'' salts, the hydrodynamic size increased rapidly, reflecting the reduced solubility of the hydrophilic parts of the polymer, i.e. the poly(ethylene oxide) grafts. Sodium sulfate, and sodium phosphate in particular, had a stronger influence on polymer aggregation than potassium chloride. This agrees with current knowledge of electrolytic effects on poly(ethylene oxide) solutions. Flow FFF was found to be a suitable characterization technique for these complex systems, rapidly and efficiently separating different polymer aggregate populations ranging from a few nanometers up to 0.1 mu m. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
12
issue
25
pages
5999 - 6005
publisher
The American Chemical Society
external identifiers
  • scopus:0000797313
ISSN
0743-7463
language
English
LU publication?
yes
id
0dbcdc0c-adb2-4aad-8f80-ff7ed806ee2a (old id 34966)
date added to LUP
2007-06-19 14:36:58
date last changed
2017-01-01 04:47:21
@article{0dbcdc0c-adb2-4aad-8f80-ff7ed806ee2a,
  abstract     = {The aggregation behavior of a charged amphiphilic graft copolymer, prepared from poly(styrene-co-methyl methacrylate-co-maleic anhydride) and poly(ethylene oxide) monomethyl ether, was studied using flow field-flow fractionation (flow FFF). This method determines the hydrodynamic size of aggregates. The polymer was shown to have a complex aggregation behavior in aqueous solutions containing salt. This was expressed in the formation of differently sized structures, from single polymer chains to large polymolecular aggregates. The polymer changed its aggregation ability in the presence of different salts and salt concentrations, as reflected by changes in hydrodynamic size. Three different salts were tested: potassium chloride, sodium sulfate, and sodium phosphate. Even at micromolar concentrations of sodium sulfate, a pronounced aggregation was observed, probably due to reduced charge repulsion. At higher concentrations of the ''salting-out'' salts, the hydrodynamic size increased rapidly, reflecting the reduced solubility of the hydrophilic parts of the polymer, i.e. the poly(ethylene oxide) grafts. Sodium sulfate, and sodium phosphate in particular, had a stronger influence on polymer aggregation than potassium chloride. This agrees with current knowledge of electrolytic effects on poly(ethylene oxide) solutions. Flow FFF was found to be a suitable characterization technique for these complex systems, rapidly and efficiently separating different polymer aggregate populations ranging from a few nanometers up to 0.1 mu m.},
  author       = {Wittgren, Bengt and Wahlund, Karl-Gustav and Dérand, Helene and Wesslén, Bengt},
  issn         = {0743-7463},
  language     = {eng},
  number       = {25},
  pages        = {5999--6005},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Size characterization of a charged amphiphilic copolymer in solutions of different salts and salt concentrations using flow field-flow},
  volume       = {12},
  year         = {1996},
}