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Salt Sensitivity of the Thermoresponsive Behavior of PNIPAAm Brushes
Leibniz Inst Polymerforsch Dresden eV, Germany; Karlsruhe Inst Technol, Germany.
Univ Nebraska Lincoln, NE 68588 USA; Biolin Sci Inc, NJ 07652 USA.
Leibniz Inst Polymerforsch Dresden eV, Germany.
Leibniz Inst Polymerforsch Dresden eV, Germany.
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2018 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 34, no 7, p. 2448-2454Article in journal (Refereed) Published
Abstract [en]

We report investigations on the salt sensitivity of the thermoresponsive behavior of PNIPAAm brushes applying the quartz crystal microbalance coupled with spectroscopic ellipsometry technique. This approach enables a detailed study of the optical and mechanical behavior of the polymer coatings. Additional conclusions can be drawn from the difference between both techniques due to a difference in the contrast mechanism of both methods. A linear shift of the phase transition temperature to lower temperatures with the addition of sodium chloride was found, similar to the behavior of free polymer chains in solution. The thermal hysteresis was found to be decreased by the addition of sodium chloride to the solution, hinting to the interaction of the ions with the amide groups of the polymer, whereby the formation of hydrogen bonds is hindered. The results of this study are of relevance to the application of PNIPAAm brushes in biological fluids and demonstrate the additional potential of the ion sensitivity besides the better known thermosensitivity.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 34, no 7, p. 2448-2454
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-145760DOI: 10.1021/acs.langmuir.7b03919ISI: 000426013000008PubMedID: 29356537OAI: oai:DiVA.org:liu-145760DiVA, id: diva2:1192489
Note

Funding Agencies|German Science Foundation (DFG) within the DFG-NSF cooperation project (DFG) [STA 324/49-1, EI 317/6-1]; "Polymer-Solid Contacts: Interfaces and Interphases" (DFG) [SPP 1369, STA 324/37-1]; National Science Foundation (NSF) through the Center for Nanohybrid Functional Materials [EPS-1004094]

Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-03-22

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CiteExportLink to record
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