- Title
- pH-responsive brush-modified silica hybrids synthesized by surface-initiated ARGET ATRP
- Creator
- Cheesman, Benjamin T.; Willott, Joshua D.; Webber, Grant B.; Edmondson, Steve; Wanless, Erica J.
- Relation
- ACS Macro Letters Vol. 1, Issue 10, p. 1161-1165
- Publisher Link
- http://dx.doi.org/10.1021/mz3003566
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2012
- Description
- Brush-modified silica hybrids have been synthesized by growing poly(2-(diethylamino)ethyl methacrylate) (poly(DEA)) brushes on 120 nm diameter silica particles by surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP). This is the first report of using SI-ARGET ATRP to synthesize poly(DEA) brushes. The kinetics of poly(DEA) brush growth in 4:1 v/v ethanol/water was monitored. The hydrodynamic diameter of the resulting brush-modified particles was dependent on the solution pH due to the weak polybasic nature of the brushes. Below the pKa of poly(DEA), the hydrodynamic diameter of the brush-modified particles increased with decreasing pH as a consequence of brush protonation, rearrangement and solvent uptake. This pH-response of the brushes was reversible and the hybrid particles exhibited significant hydrodynamic volume changes of up to 200% when the solution pH was cycled from pH 7 to pH 4.
- Subject
- SI-ARGET ATRP; brush protonation; poly(DEA) brushes; pH
- Identifier
- http://hdl.handle.net/1959.13/1325437
- Identifier
- uon:25268
- Identifier
- ISSN:2161-1653
- Language
- eng
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