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On the rheology of mixed systems of hydrophobically modified polyacrylate microgels and surfactants : Role of the surfactant architecture

Alves, Luís; Lindman, Björn LU ; Klotz, Björn; Böttcher, Axel; Haake, Hans Martin and Antunes, Filipe E. LU (2018) In Journal of Colloid and Interface Science 513. p.489-496
Abstract

Hypothesis The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles. Experiments The influence of surfactants addition on the rheological properties and transparency of HMCL-PAA suspensions was determined. A systematic study was performed... (More)

Hypothesis The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles. Experiments The influence of surfactants addition on the rheological properties and transparency of HMCL-PAA suspensions was determined. A systematic study was performed using different types of surfactants (ionic, non-ionic and zwitterionic). Findings The gelation efficiency of HMCL-PAA suspensions at low pH is strongly dependent on surfactant architecture: ionic surfactants are found to be much more efficient than non-ionic or zwitterionic surfactants. Ionic surfactants lead to a liquid-to-gel transition accompanied by an increase of transparency of the suspensions. Among the ionic surfactants, anionics show stronger interactions with the polymer. Also the surfactant hydrophobicity is relevant; the more hydrophobic the surfactant, the stronger is the binding to the polymer and thus the larger the particle swelling.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Crosslinked polymer, Gelation, Hydrophobic association, Poly(acrylic acid) derivative, Polymer/surfactant association, Surfactant binding
in
Journal of Colloid and Interface Science
volume
513
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85034853825
ISSN
0021-9797
DOI
10.1016/j.jcis.2017.11.047
language
English
LU publication?
yes
id
bcb6e3f1-490c-438e-a624-478ced39de28
date added to LUP
2017-12-07 10:11:49
date last changed
2018-10-03 10:32:41
@article{bcb6e3f1-490c-438e-a624-478ced39de28,
  abstract     = {<p>Hypothesis The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles. Experiments The influence of surfactants addition on the rheological properties and transparency of HMCL-PAA suspensions was determined. A systematic study was performed using different types of surfactants (ionic, non-ionic and zwitterionic). Findings The gelation efficiency of HMCL-PAA suspensions at low pH is strongly dependent on surfactant architecture: ionic surfactants are found to be much more efficient than non-ionic or zwitterionic surfactants. Ionic surfactants lead to a liquid-to-gel transition accompanied by an increase of transparency of the suspensions. Among the ionic surfactants, anionics show stronger interactions with the polymer. Also the surfactant hydrophobicity is relevant; the more hydrophobic the surfactant, the stronger is the binding to the polymer and thus the larger the particle swelling.</p>},
  author       = {Alves, Luís and Lindman, Björn and Klotz, Björn and Böttcher, Axel and Haake, Hans Martin and Antunes, Filipe E.},
  issn         = {0021-9797},
  keyword      = {Crosslinked polymer,Gelation,Hydrophobic association,Poly(acrylic acid) derivative,Polymer/surfactant association,Surfactant binding},
  language     = {eng},
  month        = {03},
  pages        = {489--496},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {On the rheology of mixed systems of hydrophobically modified polyacrylate microgels and surfactants : Role of the surfactant architecture},
  url          = {http://dx.doi.org/10.1016/j.jcis.2017.11.047},
  volume       = {513},
  year         = {2018},
}