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Nonionic polymers and surfactants: Temperature anomalies revisited

Lindman, Björn LU and Karlström, Gunnar LU (2009) In Comptes Rendus. Chimie 12(1-2). p.121-128
Abstract
In view of a rapidly increasing importance in applications, as well as significant fundamental observations, the temperature anomalies displayed by several oxyethylene compounds, including poly(ethylene glycol), and oxyethylene surfactants and copolymers continue to create interest but also controversies. Here we review a wide range of experimental observations and present the different theoretical approaches that have been suggested. We find that a model that attributes the temperature effects to conformational changes that make the oxyethylene groups less polar at higher temperature has a strong predictive power and gives a quantitative rationalization of phase diagrams and other observations. In line with observations, it also predicts... (More)
In view of a rapidly increasing importance in applications, as well as significant fundamental observations, the temperature anomalies displayed by several oxyethylene compounds, including poly(ethylene glycol), and oxyethylene surfactants and copolymers continue to create interest but also controversies. Here we review a wide range of experimental observations and present the different theoretical approaches that have been suggested. We find that a model that attributes the temperature effects to conformational changes that make the oxyethylene groups less polar at higher temperature has a strong predictive power and gives a quantitative rationalization of phase diagrams and other observations. In line with observations, it also predicts that the behaviour is not restricted to aqueous solutions but also occurs in other solvents. Different NMR approaches as well as Raman spectroscopy directly demonstrate the conformational behaviour predicted. We also note that the relevant molecular segment also occurs in other compounds, like cellulose derivatives such as methylcellulose. In line with this, qualitatively the same type of temperature anomalies is found for these compounds as with oxyethylene-containing substances. To cite this article: Bjo: Lindman, G. Karlstrom, C R. Chimie 12 (2009). (C) 2008 Academie des sciences. Published by Elsevier Masson SAS. All fights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Clouding, Nonionic surfactants, Oxyethylene compounds
in
Comptes Rendus. Chimie
volume
12
issue
1-2
pages
121 - 128
publisher
Elsevier
external identifiers
  • wos:000263789800013
  • scopus:59249101011
ISSN
1631-0748
DOI
10.1016/j.crci.2008.06.017
language
English
LU publication?
yes
id
6011d055-69f4-4590-8adb-f33cd7dfb10a (old id 1371938)
date added to LUP
2009-05-08 15:44:18
date last changed
2017-01-01 04:59:07
@article{6011d055-69f4-4590-8adb-f33cd7dfb10a,
  abstract     = {In view of a rapidly increasing importance in applications, as well as significant fundamental observations, the temperature anomalies displayed by several oxyethylene compounds, including poly(ethylene glycol), and oxyethylene surfactants and copolymers continue to create interest but also controversies. Here we review a wide range of experimental observations and present the different theoretical approaches that have been suggested. We find that a model that attributes the temperature effects to conformational changes that make the oxyethylene groups less polar at higher temperature has a strong predictive power and gives a quantitative rationalization of phase diagrams and other observations. In line with observations, it also predicts that the behaviour is not restricted to aqueous solutions but also occurs in other solvents. Different NMR approaches as well as Raman spectroscopy directly demonstrate the conformational behaviour predicted. We also note that the relevant molecular segment also occurs in other compounds, like cellulose derivatives such as methylcellulose. In line with this, qualitatively the same type of temperature anomalies is found for these compounds as with oxyethylene-containing substances. To cite this article: Bjo: Lindman, G. Karlstrom, C R. Chimie 12 (2009). (C) 2008 Academie des sciences. Published by Elsevier Masson SAS. All fights reserved.},
  author       = {Lindman, Björn and Karlström, Gunnar},
  issn         = {1631-0748},
  keyword      = {Clouding,Nonionic surfactants,Oxyethylene compounds},
  language     = {eng},
  number       = {1-2},
  pages        = {121--128},
  publisher    = {Elsevier},
  series       = {Comptes Rendus. Chimie},
  title        = {Nonionic polymers and surfactants: Temperature anomalies revisited},
  url          = {http://dx.doi.org/10.1016/j.crci.2008.06.017},
  volume       = {12},
  year         = {2009},
}