Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators

Polymerization rates in SDS/monomer/water oil-in-water microemulsions were measured employing a water-soluble (2,2-azobis(2-amidinopropano), ABAP) and an oil-soluble (2,2-azobis(isobutyronitrile), AIBN) photoinitiators. Monomers of widely different hydrophobicity, ranging from acrylamide and metha...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	ENCINAS,M.V., LISSI,E.A., RUFS,A.M.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2000
Materias:	Microemulsion polymerization photoinitiation monomers of different hydrophobicity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000300011
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0366-16442000000300011
record_format	dspace
spelling	oai:scielo:S0366-164420000003000112001-03-23Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiatorsENCINAS,M.V.LISSI,E.A.RUFS,A.M. Microemulsion polymerization photoinitiation monomers of different hydrophobicity Polymerization rates in SDS/monomer/water oil-in-water microemulsions were measured employing a water-soluble (2,2-azobis(2-amidinopropano), ABAP) and an oil-soluble (2,2-azobis(isobutyronitrile), AIBN) photoinitiators. Monomers of widely different hydrophobicity, ranging from acrylamide and methacrylic acid to ethylhexyl methacrylate (EHMA) and styrene, were employed in order to evaluate the role of the monomer distribution between the aqueous and microaggregate pseudophases on the photoinitiation efficiency. ABAP was more efficient initiator, irrespective of the monomer distribution. The lower efficiency of AIBN was explained in terms of intracage geminate recombination. The initiation efficiency of AIBN relative to ABAP varied from 0.35 (EHMA) to 0.02 (styrene). The high value for EHMA indicates that the initiation is due to radicals generated in the microaggegates, and that nearly one third of radicals avoids recombination in the original supercage. The low value of styrene is explained in terms of a fast addition to the monomer that reduces the radical exit rateinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.45 n.3 20002000-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000300011en10.4067/S0366-16442000000300011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Microemulsion polymerization photoinitiation monomers of different hydrophobicity
spellingShingle	Microemulsion polymerization photoinitiation monomers of different hydrophobicity ENCINAS,M.V. LISSI,E.A. RUFS,A.M. Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
description	Polymerization rates in SDS/monomer/water oil-in-water microemulsions were measured employing a water-soluble (2,2-azobis(2-amidinopropano), ABAP) and an oil-soluble (2,2-azobis(isobutyronitrile), AIBN) photoinitiators. Monomers of widely different hydrophobicity, ranging from acrylamide and methacrylic acid to ethylhexyl methacrylate (EHMA) and styrene, were employed in order to evaluate the role of the monomer distribution between the aqueous and microaggregate pseudophases on the photoinitiation efficiency. ABAP was more efficient initiator, irrespective of the monomer distribution. The lower efficiency of AIBN was explained in terms of intracage geminate recombination. The initiation efficiency of AIBN relative to ABAP varied from 0.35 (EHMA) to 0.02 (styrene). The high value for EHMA indicates that the initiation is due to radicals generated in the microaggegates, and that nearly one third of radicals avoids recombination in the original supercage. The low value of styrene is explained in terms of a fast addition to the monomer that reduces the radical exit rate
author	ENCINAS,M.V. LISSI,E.A. RUFS,A.M.
author_facet	ENCINAS,M.V. LISSI,E.A. RUFS,A.M.
author_sort	ENCINAS,M.V.
title	Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
title_short	Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
title_full	Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
title_fullStr	Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
title_full_unstemmed	Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators
title_sort	effect of the monomer hydrophobicity on the microemulsion polymerization.: a comparison of the efficiency of water- and oil-soluble photoinitiators
publisher	Sociedad Chilena de Química
publishDate	2000
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000300011
work_keys_str_mv	AT encinasmv effectofthemonomerhydrophobicityonthemicroemulsionpolymerizationacomparisonoftheefficiencyofwaterandoilsolublephotoinitiators AT lissiea effectofthemonomerhydrophobicityonthemicroemulsionpolymerizationacomparisonoftheefficiencyofwaterandoilsolublephotoinitiators AT rufsam effectofthemonomerhydrophobicityonthemicroemulsionpolymerizationacomparisonoftheefficiencyofwaterandoilsolublephotoinitiators
_version_	1718438114351906816

Effect of the monomer hydrophobicity on the microemulsion polymerization.: A comparison of the efficiency of water- and oil-soluble photoinitiators

Ejemplares similares