Counterion-Induced UCST for Polycations

Erno Karjalainen; Vladimir Aseyev; Heikki Tenhu

doi:10.1021/ma501924r

Counterion-Induced UCST for Polycations

Erno Karjalainen, Vladimir Aseyev, Heikki Tenhu (Corresponding Author)

Not published at VTT

University of Helsinki

Research output: Contribution to journal › Article › Scientific › peer-review

59 Citations (Scopus)

Abstract

A method to promote upper crit. soln. temp. (UCST) type of behavior for polycations is introduced. This relies on in situ introduction of a hydrophobic anion to an aq. soln. of a polycation in the presence of sufficient ionic strength. This was studied using two polycations: poly(2-methacryloyloxyethyltrimethylammonium iodide) and poly(3-methyl-1-(4-vinylbenzyl)imidazolium chloride). The soln. behavior of the polymers was investigated in the presence of bis(trifluoromethane)sulfonamide (NTf2) and trifluoromethanesulfonate (OTf), adjusting the ionic strength with sodium chloride. All the four studied cation-anion pairs undergo an UCST type phase sepn. The phase sepn. was reversible and only very weakly dependent on polymer concn. in the studied range.

Original language	English
Pages (from-to)	7581-7587
Number of pages	7
Journal	Macromolecules
Volume	47
Issue number	21
DOIs	https://doi.org/10.1021/ma501924r
Publication status	Published - 2014
MoE publication type	A1 Journal article-refereed

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abstract = "A method to promote upper crit. soln. temp. (UCST) type of behavior for polycations is introduced. This relies on in situ introduction of a hydrophobic anion to an aq. soln. of a polycation in the presence of sufficient ionic strength. This was studied using two polycations: poly(2-methacryloyloxyethyltrimethylammonium iodide) and poly(3-methyl-1-(4-vinylbenzyl)imidazolium chloride). The soln. behavior of the polymers was investigated in the presence of bis(trifluoromethane)sulfonamide (NTf2) and trifluoromethanesulfonate (OTf), adjusting the ionic strength with sodium chloride. All the four studied cation-anion pairs undergo an UCST type phase sepn. The phase sepn. was reversible and only very weakly dependent on polymer concn. in the studied range.",

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AU - Aseyev, Vladimir

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AB - A method to promote upper crit. soln. temp. (UCST) type of behavior for polycations is introduced. This relies on in situ introduction of a hydrophobic anion to an aq. soln. of a polycation in the presence of sufficient ionic strength. This was studied using two polycations: poly(2-methacryloyloxyethyltrimethylammonium iodide) and poly(3-methyl-1-(4-vinylbenzyl)imidazolium chloride). The soln. behavior of the polymers was investigated in the presence of bis(trifluoromethane)sulfonamide (NTf2) and trifluoromethanesulfonate (OTf), adjusting the ionic strength with sodium chloride. All the four studied cation-anion pairs undergo an UCST type phase sepn. The phase sepn. was reversible and only very weakly dependent on polymer concn. in the studied range.

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DO - 10.1021/ma501924r

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EP - 7587

JO - Macromolecules

JF - Macromolecules

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Counterion-Induced UCST for Polycations

Abstract

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