liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Surface-confined photopolymerization of pH-responsive acrylamide/acrylate brushes on polymer thin films
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
Show others and affiliations
2008 (English)In: Langmuir, ISSN 0743-7463, Vol. 24, no 14, 7559-7564 p.Article in journal (Refereed) Published
Abstract [en]

Dynamic acrylamide/acrylate polymeric brushes were synthesized at gold-plated quartz crystal surfaces. The crystals were initially coated with polystyrene-type thin films, derivatized with photolabile iniferter groups, and subsequently subjected to photoinitiated polymerization in acrylamide/acrylate monomer feeds. This surface-confined polymerization method enabled direct photocontrol over the polymerization, as followed by increased frequency responses of the crystal oscillations in a quartz crystal microbalance (QCM). The produced polymer layers were also found to be highly sensitive to external acid/base stimuli. Large oscillation frequency shifts were detected when the brushes were exposed to buffer solutions of different pH. The dynamic behavior of the resulting polymeric brushes was evaluated, and the extent of expansion and contraction of the films was monitored by the QCM setup in situ in real time. The resulting responses were rapid, and the effects were fully reversible. Low pH resulted in full contractions of the films, whereas higher pH yielded maximal expansion in order to minimize repulsion around the charged acrylate centers. The surfaces also proved to be very robust because the responsiveness was reproducible over many cycles of repeated expansion and contraction. Using ellipsometry, copolymer layers were estimated to be ∼220 nm in a collapsed state and ∼340 nm in the expanded state, effectively increasing the thickness of the film by 55%. © 2008 American Chemical Society.

Place, publisher, year, edition, pages
2008. Vol. 24, no 14, 7559-7564 p.
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-44967DOI: 10.1021/la800700hLocal ID: 78671OAI: diva2:265829
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-10

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Myrskog, Annica
By organisation
The Institute of TechnologySensor Science and Molecular Physics
In the same journal
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 22 hits
ReferencesLink to record
Permanent link

Direct link