INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS

The intermolecular association of amphipathic polyelectrolytes is studied using fluorescence and conductivity methods. This type of interaction is evidenced by the decrease in the average distances between charges as the polyelectrolyte side chain increases in length. This modify the dissociation de...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	RÍOS,HERNÁN E, URZÚA,MARCELA D, VILLALOBOS,VALERIA, VARGAS,VÍCTOR A
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2016
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000400027
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0717-97072016000400027
record_format	dspace
spelling	oai:scielo:S0717-970720160004000272017-01-16INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONSRÍOS,HERNÁN EURZÚA,MARCELA DVILLALOBOS,VALERIAVARGAS,VÍCTOR AThe intermolecular association of amphipathic polyelectrolytes is studied using fluorescence and conductivity methods. This type of interaction is evidenced by the decrease in the average distances between charges as the polyelectrolyte side chain increases in length. This modify the dissociation degree and consequently, the linear charge density parameter. These distances were calculated with the Manning counterion condensation theory for the conductivity of polyelectrolyte solutions. The determination of the ratio I1/I3 of the fluorescence bands of pyrene with polymer content reveals the formation of hydrophobic microdomains at very low concentrations, smaller than the required concentration to produce a significant change in the average distances between charges. These distances and also the I1/I3 ratio vary with polymer concentration and their values were dependent on the size of the side chain in the polyelectrolyte. Finally, the experimental behavior of the solution viscosity and electrical conductivity of polyelectrolytes, which increase drastically with dilution, can be explained as a continuous change in the average distances between charges which produce conformational changes.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.61 n.4 20162016-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000400027en10.4067/S0717-97072016000400027
institution	Scielo Chile
collection	Scielo Chile
language	English
description	The intermolecular association of amphipathic polyelectrolytes is studied using fluorescence and conductivity methods. This type of interaction is evidenced by the decrease in the average distances between charges as the polyelectrolyte side chain increases in length. This modify the dissociation degree and consequently, the linear charge density parameter. These distances were calculated with the Manning counterion condensation theory for the conductivity of polyelectrolyte solutions. The determination of the ratio I1/I3 of the fluorescence bands of pyrene with polymer content reveals the formation of hydrophobic microdomains at very low concentrations, smaller than the required concentration to produce a significant change in the average distances between charges. These distances and also the I1/I3 ratio vary with polymer concentration and their values were dependent on the size of the side chain in the polyelectrolyte. Finally, the experimental behavior of the solution viscosity and electrical conductivity of polyelectrolytes, which increase drastically with dilution, can be explained as a continuous change in the average distances between charges which produce conformational changes.
author	RÍOS,HERNÁN E URZÚA,MARCELA D VILLALOBOS,VALERIA VARGAS,VÍCTOR A
spellingShingle	RÍOS,HERNÁN E URZÚA,MARCELA D VILLALOBOS,VALERIA VARGAS,VÍCTOR A INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
author_facet	RÍOS,HERNÁN E URZÚA,MARCELA D VILLALOBOS,VALERIA VARGAS,VÍCTOR A
author_sort	RÍOS,HERNÁN E
title	INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
title_short	INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
title_full	INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
title_fullStr	INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
title_full_unstemmed	INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS
title_sort	intermolecular association of amphipathic polyelectrolytes in aqueous solutions
publisher	Sociedad Chilena de Química
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072016000400027
work_keys_str_mv	AT rioshernane intermolecularassociationofamphipathicpolyelectrolytesinaqueoussolutions AT urzuamarcelad intermolecularassociationofamphipathicpolyelectrolytesinaqueoussolutions AT villalobosvaleria intermolecularassociationofamphipathicpolyelectrolytesinaqueoussolutions AT vargasvictora intermolecularassociationofamphipathicpolyelectrolytesinaqueoussolutions
_version_	1714200904257765376

INTERMOLECULAR ASSOCIATION OF AMPHIPATHIC POLYELECTROLYTES IN AQUEOUS SOLUTIONS

Ejemplares similares