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Tuning the LCST of PNIPAM via Random Oxidation-Sensitive Thioether Functionalities
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 4
2017 (English)In: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 218, no 9, UNSP 1600556Article in journal (Refereed) Published
Abstract [en]

In this work, an oxidation-responsive thioether-functionalized poly(N-isopropylacrylamide) is reported, which is synthesized via reversible-addition fragmentation transfer (RAFT) polymerization using 6-(methylthio)hexyl acrylate or 2-(methylthio)ethyl acrylate as comonomers and S-ethyl-S-(a,a-dimethyl-a-acetic acid)trithiocarbonate as RAFT agent, investigating the influence over the lower critical solution temperature (LCST) of the random thioether functionalities, prior and upon oxidation. The hydrophobic thioethers shift the LCST values of the resulting copolymers to very low temperatures, but the value could be regulated upon oxidation due to the huge increase in dipolar moment. The resulting copolymers containing hydrophilic sulfoxides show much higher LCST values, reaching a difference of up to 23 degrees C after oxidation. Results are supported by H-1 NMR, size exclusion chromatography, and turbidimetry measurements.

Place, publisher, year, edition, pages
2017. Vol. 218, no 9, UNSP 1600556
Keyword [en]
LCST, oxidation-responsive, PNIPAM
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-143383DOI: 10.1002/macp.201600556ISI: 000400649700004OAI: oai:DiVA.org:su-143383DiVA: diva2:1105218
Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02Bibliographically approved

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Valencia, Luis
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