Effect of the Density of ATRP Thiol Initiators in the Yield and Water Content of Grafted-From PMETAC Brushes. A Study by Means of QCM-D and Spectroscopic Ellipsometry Combined in a Single Device
✍ Scribed by Jagoba Iturri Ramos; Sergio E. Moya
- Book ID
- 102942011
- Publisher
- John Wiley and Sons
- Year
- 2012
- Tongue
- English
- Weight
- 658 KB
- Volume
- 213
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Poly {[2‐(methacryloyloxy)ethyl] trimethylammonium chloride} (PMETAC) brushes are synthesized by atom transfer radical polymerization from mixed monolayers of ω‐mercaptoundecyl bromoisobutyrate thiol (initiator) and 1‐undecanethiol (blank). Initiator density is varied from 100% to 1% by the molar ratio of initiator to blank in solution. Brush growth is followed in situ by a single device combination of a quartz crystal microbalance with dissipation (QCM‐D) and spectroscopic ellipsometry. Acoustic mass (m~acous~) and optical mass (m~opt~) are simultaneously recorded. Brush hydration is calculated from the difference between m~acous~ and m~opt~. The percentage of water lost during brush collapse in NaCl solution at concentration from 10^−3^ M to 1 M is quantified for each initiator density.