CE and asymmetrical flow field flow fractionation studies of polymer interactions with surfaces and solutes reveal conformation changes of polymers

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Witos , J , Karjalainen , E , Tenhu , H & Wiedmer , S K 2020 , ' CE and asymmetrical flow field flow fractionation studies of polymer interactions with surfaces and solutes reveal conformation changes of polymers ' , Journal of Separation Science , vol. 43 , no. 12 , pp. 2495-2505 . https://doi.org/10.1002/jssc.201901301

Title: CE and asymmetrical flow field flow fractionation studies of polymer interactions with surfaces and solutes reveal conformation changes of polymers
Author: Witos, Joanna; Karjalainen, Erno; Tenhu, Heikki; Wiedmer, Susanne K.
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2020-06
Language: eng
Number of pages: 11
Belongs to series: Journal of Separation Science
ISSN: 1615-9306
URI: http://hdl.handle.net/10138/317828
Abstract: Amphiphilic diblock copolymers consisting of a hydrophobic core containing a polymerized ionic liquid and an outer shell composed of poly(N-isoprolylacrylamide) were investigated by capillary electrophoresis and asymmetrical flow-field flow fractionation. The polymerized ionic liquid comprised poly(2-(1-butylimidazolium-3-yl)ethyl methacrylate tetrafluoroborate) with a constant block length (n = 24), while the length of the poly(N-isoprolylacrylamide) block varied (n = 14; 26; 59; 88). Possible adsorption of the block copolymer on the fused silica capillary, due to alterations in the polymeric conformation upon a change in the temperature (25 and 45 degrees C), was initially studied. For comparison, the effect of temperature on the copolymer conformation/hydrodynamic size was determined with the aid of asymmetrical flow-field flow fractionation and light scattering. To get more information about the hydrophilic/hydrophobic properties of the synthesized block copolymers, they were used as a pseudostationary phase in electrokinetic chromatography for the separation of some model compounds, that is, benzoates and steroids. Of particular interest was to find out whether a change in the length or concentration of the poly(N-isoprolylacrylamide) block would affect the separation of the model compounds. Overall, our results show that capillary electrophoresis and asymmetrical flow-field flow fractionation are suitable methods for characterizing conformational changes of such diblock copolymers.
Subject: AGGREGATION
BEHAVIOR
CAPILLARY-ELECTROPHORESIS
DIBLOCK COPOLYMERS
IONIC LIQUIDS
POLY(IONIC LIQUID)S
asymmetrical flow-field flow fractionation
capillary electrophoresis
poly(N-isoprolylacrylamide)
polymerized ionic liquids
thermoresponsive polymers
116 Chemical sciences
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