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Thermoresponsive behavior of poly[trialkyl-(4-vinylbenzyl)ammonium] based polyelectrolytes in aqueous salt solutions

Karjalainen, Erno; Suvarli, Narmin ORCID iD icon 1; Tenhu, Heikki
1 Institut für Bio- und Lebensmitteltechnik (BLT), Karlsruher Institut für Technologie (KIT)


This contribution reports 16 new thermoresponsive systems based on poly[trialkyl-(4-vinylbenzyl)ammonium] chlorides. When salts are introduced into solution of the water-soluble polymers, thermoresponsive behavior is observed. The type of transition is dependent on the length of the alkyl chain: the polymer with an ethyl chain has an upper critical solution temperature (UCST) whereas the polymers with butyl or pentyl chains have a lower critical solution temperature (LCST). The magnitude of the effect of a given salt on the solution behavior is dependent on the type of the used electrolyte. With all polymers, the strength of the effect increases in the following order: NaH$_{2}$PO$_{4}$ < Na$_{2}$CO$_{3}$ < Na$_{2}$SO$_{4}$ < NaCl < sodium pentanesulfonate < NaNO$_{3}$ < NaSCN < lithium trifluoromethanesulfonate < lithium bis(trifluoromethane) sulfonimide. For monovalent salts, the order follows a reversed Hofmeister series. The results can be used to design new thermosensitive systems by matching the alkyl content of a polycation with an effect of the small molecular salt. Nearly an unlimited number of thermoresponsive polymers can be designed following the approach introduced in this article.

Verlagsausgabe §
DOI: 10.5445/IR/1000125580
Veröffentlicht am 02.11.2020
DOI: 10.1039/d0py00917b
Zitationen: 11
Web of Science
Zitationen: 12
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1759-9954, 1759-9962
KITopen-ID: 1000125580
Erschienen in Polymer chemistry
Verlag Royal Society of Chemistry (RSC)
Band 11
Heft 36
Seiten 5870–5883
Vorab online veröffentlicht am 19.08.2020
Nachgewiesen in Scopus
Web of Science
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