ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION

Measurements of the electrical equivalent conductivity of potassium salts of poly(maleic acid-co-1-olefins), PA-nK2 with n = 12, 18 has been carried out in methanol-water mixtures in the whole range of composition. The relative interaction parameter f*, was determined as a function of the mole fract...

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Autores principales:	BARRAZA,RAUL G., OLEA,ANDRES F., FUENTES,IRMA, MARTINEZ,FRANCISCO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2003
Materias:	Polyelectrolytes electrical conductivity counterion condensation conformational transition
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100012
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spelling	oai:scielo:S0717-970720030001000122003-05-15ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTIONBARRAZA,RAUL G.OLEA,ANDRES F.FUENTES,IRMAMARTINEZ,FRANCISCO Polyelectrolytes electrical conductivity counterion condensation conformational transition Measurements of the electrical equivalent conductivity of potassium salts of poly(maleic acid-co-1-olefins), PA-nK2 with n = 12, 18 has been carried out in methanol-water mixtures in the whole range of composition. The relative interaction parameter f, was determined as a function of the mole fraction of methanol. The values of f do not follow the same tendency of the limiting equivalent conductivity. This unusual behavior was rationalized in terms of a methanol-induced conformational transition that takes the polymer chain from a compact to an expanded structure. As a consequence of this transition the average charge distance in the polyion increases with increasing mole fraction of methanol. This brings about a decrease of the linear charge density parameter, and therefore an increase of the fraction of polymer charges dissociated from their counterions. The existence of the conformational transition of the PA-nK2 copolymers was confirmed through fluorescence probing experimentsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.48 n.1 20032003-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100012en10.4067/S0717-97072003000100012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Polyelectrolytes electrical conductivity counterion condensation conformational transition
spellingShingle	Polyelectrolytes electrical conductivity counterion condensation conformational transition BARRAZA,RAUL G. OLEA,ANDRES F. FUENTES,IRMA MARTINEZ,FRANCISCO ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
description	Measurements of the electrical equivalent conductivity of potassium salts of poly(maleic acid-co-1-olefins), PA-nK2 with n = 12, 18 has been carried out in methanol-water mixtures in the whole range of composition. The relative interaction parameter f, was determined as a function of the mole fraction of methanol. The values of f do not follow the same tendency of the limiting equivalent conductivity. This unusual behavior was rationalized in terms of a methanol-induced conformational transition that takes the polymer chain from a compact to an expanded structure. As a consequence of this transition the average charge distance in the polyion increases with increasing mole fraction of methanol. This brings about a decrease of the linear charge density parameter, and therefore an increase of the fraction of polymer charges dissociated from their counterions. The existence of the conformational transition of the PA-nK2 copolymers was confirmed through fluorescence probing experiments
author	BARRAZA,RAUL G. OLEA,ANDRES F. FUENTES,IRMA MARTINEZ,FRANCISCO
author_facet	BARRAZA,RAUL G. OLEA,ANDRES F. FUENTES,IRMA MARTINEZ,FRANCISCO
author_sort	BARRAZA,RAUL G.
title	ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
title_short	ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
title_full	ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
title_fullStr	ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
title_full_unstemmed	ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION
title_sort	electrical conductivity of hydrophobically modified polyelectrolytes in methanol/water solution
publisher	Sociedad Chilena de Química
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000100012
work_keys_str_mv	AT barrazaraulg electricalconductivityofhydrophobicallymodifiedpolyelectrolytesinmethanolwatersolution AT oleaandresf electricalconductivityofhydrophobicallymodifiedpolyelectrolytesinmethanolwatersolution AT fuentesirma electricalconductivityofhydrophobicallymodifiedpolyelectrolytesinmethanolwatersolution AT martinezfrancisco electricalconductivityofhydrophobicallymodifiedpolyelectrolytesinmethanolwatersolution
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ELECTRICAL CONDUCTIVITY OF HYDROPHOBICALLY MODIFIED POLYELECTROLYTES IN METHANOL/WATER SOLUTION

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