Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

The role of copolymer composition on the specific ion and thermo-response of ethylene glycol-based brushes

Murdoch, Timothy J ; Humphreys, Ben A LU ; Johnson, Edwin C ; Prescott, Stuart W ; Nelson, Andrew ; Wanless, Erica J and Webber, Grant B (2018) In Polymer 138. p.229-241
Abstract
Thermoresponsive ethylene glycol based comb-polymer brushes were studied as a function of copolymer composition in aqueous electrolyte solutions. Homopolymer poly oligo(ethylene glycol) methyl ether methacrylate (POEGMA300) and statistical copolymer brushes with 60 mol% OEGMA300 and 40 mol% (di(ethyleneglycol) methyl ether methacrylate) (MEO2MA) underwent a monotonic swollen to collapsed transition with increasing temperature. Neutron reflectometry and ellipsometry measurements showed that the higher ethylene glycol content of the homopolymer brush led to a higher degree of swelling for a given temperature, with the transition occurring over a wider temperature range than the copolymer brush. Dynamic atomic... (More)
Thermoresponsive ethylene glycol based comb-polymer brushes were studied as a function of copolymer composition in aqueous electrolyte solutions. Homopolymer poly oligo(ethylene glycol) methyl ether methacrylate (POEGMA300) and statistical copolymer brushes with 60 mol% OEGMA300 and 40 mol% (di(ethyleneglycol) methyl ether methacrylate) (MEO2MA) underwent a monotonic swollen to collapsed transition with increasing temperature. Neutron reflectometry and ellipsometry measurements showed that the higher ethylene glycol content of the homopolymer brush led to a higher degree of swelling for a given temperature, with the transition occurring over a wider temperature range than the copolymer brush. Dynamic atomic force microscopy force measurements revealed minimal impact of probe velocity on normal interaction forces for the homopolymer brush. In contrast, a significant increase in both repulsion and adhesion was observed for the copolymer brush. Exposure to potassium thiocyanate solutions increased the degree of swelling at any given temperature while potassium acetate showed the opposite behaviour for both brush compositions. However, the homopolymer brushes displayed a greater increase in swelling due to thiocyanate and reduced collapse due to acetate. (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Polymer
volume
138
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85041512066
ISSN
0032-3861
DOI
10.1016/j.polymer.2018.01.053
language
English
LU publication?
no
id
d3716cd2-fe30-48cb-996e-805eec8f1d96
date added to LUP
2022-04-01 21:08:20
date last changed
2022-05-25 04:12:55
@article{d3716cd2-fe30-48cb-996e-805eec8f1d96,
  abstract     = {{Thermoresponsive ethylene glycol based comb-polymer brushes were studied as a function of copolymer composition in aqueous electrolyte solutions. Homopolymer poly oligo(ethylene glycol) methyl ether methacrylate (POEGMA<sub>300</sub>) and statistical copolymer brushes with 60 mol% OEGMA<sub>300</sub> and 40 mol% (di(ethyleneglycol) methyl ether methacrylate) (MEO<sub>2</sub>MA) underwent a monotonic swollen to collapsed transition with increasing temperature. Neutron reflectometry and ellipsometry measurements showed that the higher ethylene glycol content of the homopolymer brush led to a higher degree of swelling for a given temperature, with the transition occurring over a wider temperature range than the copolymer brush. Dynamic atomic force microscopy force measurements revealed minimal impact of probe velocity on normal interaction forces for the homopolymer brush. In contrast, a significant increase in both repulsion and adhesion was observed for the copolymer brush. Exposure to potassium thiocyanate solutions increased the degree of swelling at any given temperature while potassium acetate showed the opposite behaviour for both brush compositions. However, the homopolymer brushes displayed a greater increase in swelling due to thiocyanate and reduced collapse due to acetate.}},
  author       = {{Murdoch, Timothy J and Humphreys, Ben A and Johnson, Edwin C and Prescott, Stuart W and Nelson, Andrew and Wanless, Erica J and Webber, Grant B}},
  issn         = {{0032-3861}},
  language     = {{eng}},
  pages        = {{229--241}},
  publisher    = {{Elsevier}},
  series       = {{Polymer}},
  title        = {{The role of copolymer composition on the specific ion and thermo-response of ethylene glycol-based brushes}},
  url          = {{http://dx.doi.org/10.1016/j.polymer.2018.01.053}},
  doi          = {{10.1016/j.polymer.2018.01.053}},
  volume       = {{138}},
  year         = {{2018}},
}