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Polymerization of N,N-dimethylacrylamide in Aerosol OT-water mixtures: from lamellae to segregation

Pacios, I E; Renamayor, C S; Horta, A; Lindman, Björn LU and Thuresson, Krister LU (2003) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 218(1-3). p.11-20
Abstract
The polymerizable N,N-dimethylacrylamide (DMAA) is added to the lamellar liquid crystalline system formed by the anionic surfactant Aerosol OT and water. Small angle X-ray scattering, gives the same bilayer thickness and hydrophilic group cross-sectional area as without DMAA, and an environment sensitive fluorescent probe indicates that DMAA is likely to be in the water layers between the AOT bilayers. This shows that the structure of the AOT bilayer in the lamellar phase is not affected by DMAA. However, DMAA induces instability of the lamellar phase, and a second phase, an isotropic solution, appears for larger DMAA contents

The effect of DMAA in stabilizing this phase with respect to lamellae is much

larger than that... (More)
The polymerizable N,N-dimethylacrylamide (DMAA) is added to the lamellar liquid crystalline system formed by the anionic surfactant Aerosol OT and water. Small angle X-ray scattering, gives the same bilayer thickness and hydrophilic group cross-sectional area as without DMAA, and an environment sensitive fluorescent probe indicates that DMAA is likely to be in the water layers between the AOT bilayers. This shows that the structure of the AOT bilayer in the lamellar phase is not affected by DMAA. However, DMAA induces instability of the lamellar phase, and a second phase, an isotropic solution, appears for larger DMAA contents

The effect of DMAA in stabilizing this phase with respect to lamellae is much

larger than that expected from a simple dilution with

water. Furthermore, there is a combined influence of temperature and

DMAA concentration on the coexistence of the lamellar and the isotropic

phases. When an initiator is added and the monomer polymerizes the

tendency to phase separate increases strongly. The lamellar spacing

after polymerization is below the value predicted by the global AOT/H2O

ratio. This indicates that the polymer segregates from the AOT phase

and that the lamellar phase is osmotically compressed by the polymer

rich phase. (C) 2003 Elsevier Science B.V. All rights

reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
AOT, N, N-dimethylacrylamide, Polymerization, Lamellar
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
218
issue
1-3
pages
11 - 20
publisher
Elsevier
external identifiers
  • wos:000183508500002
  • scopus:0038242150
ISSN
0927-7757
DOI
10.1016/S0927-7757(02)00583-6
language
English
LU publication?
yes
id
e4750cae-7942-4b93-9198-00a1bdc4adbe (old id 122135)
date added to LUP
2007-07-12 09:14:23
date last changed
2018-10-03 11:30:45
@article{e4750cae-7942-4b93-9198-00a1bdc4adbe,
  abstract     = {The polymerizable N,N-dimethylacrylamide (DMAA) is added to the lamellar liquid crystalline system formed by the anionic surfactant Aerosol OT and water. Small angle X-ray scattering, gives the same bilayer thickness and hydrophilic group cross-sectional area as without DMAA, and an environment sensitive fluorescent probe indicates that DMAA is likely to be in the water layers between the AOT bilayers. This shows that the structure of the AOT bilayer in the lamellar phase is not affected by DMAA. However, DMAA induces instability of the lamellar phase, and a second phase, an isotropic solution, appears for larger DMAA contents<br/><br>
 The effect of DMAA in stabilizing this phase with respect to lamellae is much<br/><br>
	larger than that expected from a simple dilution with<br/><br>
	water. Furthermore, there is a combined influence of temperature and<br/><br>
	DMAA concentration on the coexistence of the lamellar and the isotropic<br/><br>
	phases. When an initiator is added and the monomer polymerizes the<br/><br>
	tendency to phase separate increases strongly. The lamellar spacing<br/><br>
	after polymerization is below the value predicted by the global AOT/H2O<br/><br>
	ratio. This indicates that the polymer segregates from the AOT phase<br/><br>
	and that the lamellar phase is osmotically compressed by the polymer<br/><br>
	rich phase. (C) 2003 Elsevier Science B.V. All rights<br/><br>
	reserved.},
  author       = {Pacios, I E and Renamayor, C S and Horta, A and Lindman, Björn and Thuresson, Krister},
  issn         = {0927-7757},
  keyword      = {AOT,N,N-dimethylacrylamide,Polymerization,Lamellar},
  language     = {eng},
  number       = {1-3},
  pages        = {11--20},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Polymerization of N,N-dimethylacrylamide in Aerosol OT-water mixtures: from lamellae to segregation},
  url          = {http://dx.doi.org/10.1016/S0927-7757(02)00583-6},
  volume       = {218},
  year         = {2003},
}