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Ellipsometric studies of nonionic block copolymers adsorbed at the solid/water and oil/water interfaces

Kapilashrami, A; Malmsten, M; Eskilsson, K; Benjamins, Jan-Willem LU and Nylander, Tommy LU (2003) In Colloids ad Surfaces a-Physicochemical and Engineering Aspects 225(1-3). p.181-192
Abstract
We report on the interfacial behaviour of a series of nonionic diblock copolymers at solid hydrophobic and hydrophilic surfaces/water and silicone oil/water interfaces, studied by ellipsometry. The polymers consist of a hydrophobic C-18 chain linked to a hydrophilic poly(ethylene oxide) (PEO), block varying from 50 to 250 U. The adsorption of these copolymers at low bulk concentrations was found to be dominated by the PEO block at all interfaces. At higher concentration the copolymer forms surface aggregates at the silica surface whereas we observe a gradual increase in the adsorbed layer thickness with increased surface excess at the solid hydrophobic surface, indicating a transition from a flat conformation to brush-like layer structure.... (More)
We report on the interfacial behaviour of a series of nonionic diblock copolymers at solid hydrophobic and hydrophilic surfaces/water and silicone oil/water interfaces, studied by ellipsometry. The polymers consist of a hydrophobic C-18 chain linked to a hydrophilic poly(ethylene oxide) (PEO), block varying from 50 to 250 U. The adsorption of these copolymers at low bulk concentrations was found to be dominated by the PEO block at all interfaces. At higher concentration the copolymer forms surface aggregates at the silica surface whereas we observe a gradual increase in the adsorbed layer thickness with increased surface excess at the solid hydrophobic surface, indicating a transition from a flat conformation to brush-like layer structure. The results indicate a similar evolution in adsorbed amount with concentration at the silicone oil/water interface as at the hydrophobic silica surface. The influence of the rheological proper

ies of the interface on the adsorption of the diblock copolymer was investigated by comparing results from two silicon oils with different viscosities. The copolymers were found to have stronger affinity to a low viscosity (990 mPa s) silicone oil than to a higher viscosity (12 800 mPa s) silicone oil and the hydrophobised silica surface. At the silicone oil/water interface the adsorption of a commercial nonionic triblock copolymer was furthermore investigated and compared with the diblock copolymers. (C) 2003 Elsevier B.V. All rights reserved. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Ellipsometric studies, Solid/water, Oil/water
in
Colloids ad Surfaces a-Physicochemical and Engineering Aspects
volume
225
issue
1-3
pages
181 - 192
publisher
Elsevier
external identifiers
  • WOS:000185780200018
  • Scopus:0041328713
DOI
10.1016/S0927-7757(03)00361-3
language
English
LU publication?
yes
id
55a3fda0-8331-4b59-b322-83994b51a973 (old id 122032)
date added to LUP
2007-07-11 13:39:33
date last changed
2016-10-13 04:38:06
@misc{55a3fda0-8331-4b59-b322-83994b51a973,
  abstract     = {We report on the interfacial behaviour of a series of nonionic diblock copolymers at solid hydrophobic and hydrophilic surfaces/water and silicone oil/water interfaces, studied by ellipsometry. The polymers consist of a hydrophobic C-18 chain linked to a hydrophilic poly(ethylene oxide) (PEO), block varying from 50 to 250 U. The adsorption of these copolymers at low bulk concentrations was found to be dominated by the PEO block at all interfaces. At higher concentration the copolymer forms surface aggregates at the silica surface whereas we observe a gradual increase in the adsorbed layer thickness with increased surface excess at the solid hydrophobic surface, indicating a transition from a flat conformation to brush-like layer structure. The results indicate a similar evolution in adsorbed amount with concentration at the silicone oil/water interface as at the hydrophobic silica surface. The influence of the rheological proper<br/><br>
ies of the interface on the adsorption of the diblock copolymer was investigated by comparing results from two silicon oils with different viscosities. The copolymers were found to have stronger affinity to a low viscosity (990 mPa s) silicone oil than to a higher viscosity (12 800 mPa s) silicone oil and the hydrophobised silica surface. At the silicone oil/water interface the adsorption of a commercial nonionic triblock copolymer was furthermore investigated and compared with the diblock copolymers. (C) 2003 Elsevier B.V. All rights reserved.},
  author       = {Kapilashrami, A and Malmsten, M and Eskilsson, K and Benjamins, Jan-Willem and Nylander, Tommy},
  keyword      = {Ellipsometric studies,Solid/water,Oil/water},
  language     = {eng},
  number       = {1-3},
  pages        = {181--192},
  publisher    = {ARRAY(0x87cd2a8)},
  series       = {Colloids ad Surfaces a-Physicochemical and Engineering Aspects},
  title        = {Ellipsometric studies of nonionic block copolymers adsorbed at the solid/water and oil/water interfaces},
  url          = {http://dx.doi.org/10.1016/S0927-7757(03)00361-3},
  volume       = {225},
  year         = {2003},
}