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

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Karjalainen , E , Suvarli , N & Tenhu , H 2020 , ' Thermoresponsive behavior of poly[trialkyl-(4-vinylbenzyl)ammonium] based polyelectrolytes in aqueous salt solutions ' , Polymer Chemistry , vol. 11 , no. 36 , pp. 5870-5883 . https://doi.org/10.1039/d0py00917b

Title: Thermoresponsive behavior of poly[trialkyl-(4-vinylbenzyl)ammonium] based polyelectrolytes in aqueous salt solutions
Author: Karjalainen, Erno; Suvarli, Narmin; Tenhu, Heikki
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2020-09-28
Language: eng
Number of pages: 14
Belongs to series: Polymer Chemistry
ISSN: 1759-9954
URI: http://hdl.handle.net/10138/321995
Abstract: 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: NaH2PO4<Na2CO3<Na2SO4<NaCl <sodium pentanesulfonate <NaNO3<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.
Subject: CRITICAL SOLUTION TEMPERATURE
POLYMERIZED IONIC LIQUIDS
PHASE-SEPARATION BEHAVIOR
POLY(IONIC LIQUID)
HYDROPHOBIC INTERACTION
VISCOELASTIC BEHAVIOR
HELICAL POLYPEPTIDES
HOFMEISTER ANIONS
CHAIN TRANSFER
WATER
116 Chemical sciences
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