pH-responsive behavior of selectively quaternized diblock copolymers adsorbed at the silica/aqueous solution interface

Sakai, Kenichi, Smith, Emelyn G., Webber, Grant B., Baker, Murray, Wanless, Erica J., Butun, Vural, Armes, Steven P. and Biggs, Simon (2007) pH-responsive behavior of selectively quaternized diblock copolymers adsorbed at the silica/aqueous solution interface. Journal of Colloid and Interface Science, 314 2: 381-388. doi:10.1016/j.jcis.2007.06.018


Author Sakai, Kenichi
Smith, Emelyn G.
Webber, Grant B.
Baker, Murray
Wanless, Erica J.
Butun, Vural
Armes, Steven P.
Biggs, Simon
Title pH-responsive behavior of selectively quaternized diblock copolymers adsorbed at the silica/aqueous solution interface
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
1095-7103
Publication date 2007-10-15
Sub-type Article (original research)
DOI 10.1016/j.jcis.2007.06.018
Open Access Status Not yet assessed
Volume 314
Issue 2
Start page 381
End page 388
Total pages 8
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Language eng
Formatted abstract
The desorption and subsequent pH-responsive behavior of selectively quaternized poly(2-(dimethylamino)ethyl methacrylate)-block-poly(2-(diethylamino)ethyl methacrylate) (PDMA-PDEA) films at the silica/aqueous solution interface has been characterized. The copolymer films were prepared at pH 9, where micelle-like surface aggregates are spontaneously formed on silica. The subsequent rinse with a copolymer-free electrolyte solution adjusted to pH 9 causes partial desorption of the weakly or non-quaternized copolymers, but negligible desorption for the highly quaternized copolymers. Further rinsing with a pH 4 electrolyte solution results in additional desorption and extension (swelling) of the remaining adsorbed copolymer film normal to the interface. This pH-responsive behavior is reversible for two pH cycles (9-4-9-4) as monitored by both quartz crystal microbalance with dissipation monitoring (QCM-D) and also ζ potential measurements. The magnitude of the pH-responsive behavior depends on the mean degree of quaternization of the PDMA block. Moreover, a combination of contact angle data, ζ potential measurements and in situ atomic force microscopy (AFM) studies indicates that the pH-responsive behavior is influenced not only by the number of cationic binding sites on the adsorbed copolymer chains but also by the adsorbed layer structure.
Keyword Adsorption
Desorption
pH-responsive diblock copolymer
Quaternization
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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