Direct measurement of H+ activity inside cross-linked functional polymers using nitroxide spin probes / Molochnikov L.S., Kovalyova E.G., Grigor'ev I.A., Zagorodni A.A. // Journal of Physical Chemistry B. - 2004. - V. 108, l. 4. - P. 1302-1313.

ISSN:

15206106

Type:

Article

Abstract:

The lack of a direct method for measuring activity inside ion-exchange resins was the main obstacle for strict thermodynamic investigations of such objects during the past decades. This paper proposes a method for the activity determination. The method is based on exploring the ESR response of stable nitroxide radicals introduced as probes into the resin phase. This method allows for the measurement of the hydrogen ion activity inside cross-linked polyelectrolytes. In addition to the method verification, the paper reports its application to the determination of ionization constants of functional groups and to the investigation of the hydrolysis and sorption of copper on different types of sorbents (weak cation and anion-exchange resins, functionalized and nonfunctionalized polymeric films). The applicability of known thermodynamic approaches developed for the investigation of micelles and biomembranes with nitroxide radicals is discussed. The paper also includes a critical analysis of the potentiometric method conventionally used for the investigation of ion-exchange equilibria.

Author keywords:

Index keywords:

Chemical activation; Copper; Crosslinking; Hydrogen; Hydrolysis; Ion exchange resins; Ionization; Paramagnetic resonance; Polyelectrolytes; Probes; Sorption; Thermodynamic properties; Ion exchange equ

DOI:

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Affiliations	Ural State Wood Technology Academy, 37 Siberian Highway, Ekaterinburg 620032, Russian Federation; Institute of Organic Chemistry, Siberian Br. of Russian Acad of Sci., Lavrent'ev's Avenue, 9 Novosibirsk 630090, Russian Federation; Materials Chemistry, Royal Institute of Technology, 100 44 Strockholm, Sweden
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Correspondence Address	Zagorodni, A.A.; Materials Chemistry, Royal Institute of Technology, 100 44 Strockholm, Sweden; email: andreyz@matchem.kth.se
CODEN	JPCBF
Language of Original Document	English
Abbreviated Source Title	J Phys Chem B
Source	Scopus