<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-2738</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Ing. Quím]]></abbrev-journal-title>
<issn>1665-2738</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-27382008000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Polimerización en microemulsión: construyendo un modelo utilizando la conversión experimental y su derivada]]></article-title>
<article-title xml:lang="en"><![CDATA[Microemulsion polymerization: building a model using the experimental conversion and its derivative]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Serrano]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Aguilar]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendizábal]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puig]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Departamento de Ingeniería Química Facultad de Química]]></institution>
<addr-line><![CDATA[México D. F]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias Exactas e Ingenierías (CUCEI) Departamentos de Química e Ingeniería Química]]></institution>
<addr-line><![CDATA[Guadalajara Jalisco]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Iztapalapa Departamento de Ingeniería de Procesos e Hidráulica ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<volume>7</volume>
<numero>1</numero>
<fpage>79</fpage>
<lpage>87</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-27382008000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-27382008000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-27382008000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo se propone un modelo basado en conceptos cinéticos, termodinámicos y fisicoquímicos y se utiliza un enfoque integrodiferencial (ID) para encontrar los mecanismos fundamentales de la polimerización en microemulsión (PME). El procedimiento ID se aplica a datos experimentales de conversión del metacrilato de hexilo (C6MA) y del estireno (STY) en la PME. Este procedimiento permitió encontrar que: (i) la rapidez de nucleación no es lineal con el tiempo, contrario a lo reportado con anterioridad, (ii) la coagulación entre partículas es despreciable, (iii) las micelas aportan monómero a las partículas reaccionantes, (iv) el efecto vítreo es importante, aun en polímeros con Tg menor a la temperatura de reacción, (v) la entrada de radicales a las partículas es despreciable, confirmando propuestas anteriores, (vi) el intervalo de rapidez decreciente de reacción, además de la disminución de monómero, se debe a la disminución de sitios activos, y (vii) un modelo fenomenológico de tres parámetros es capaz de describir todos los sistemas estudiados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A model based on kinetic, thermodynamic and physicochemical concepts, is presented and an integrodifferential approach to find the fundamental events, is used for microemulsion polymerization (MEP). The procedure was applied to experimental conversion data of hexyl methacrylate (C6MA) and styrene (STY) in MEP. It was found that: (i) nucleation rate is not linear with time, opposed to previous reports, (ii) coagulation rate is negligible, (iii) micelles provide monomer to reacting particles, (iv) a vitreous effect, even in polymers with a Tg lower than the reaction temperature, was found, (v) radical entry to particles is negligible confirming previous reports, (vi) the decreasing reaction rate interval, besides monomer depletion, is caused by a decrease in active reaction sites, and (vii) a three-parameter phenomenological model is presented capable of describing the studied systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estireno]]></kwd>
<kwd lng="es"><![CDATA[mecanismo]]></kwd>
<kwd lng="es"><![CDATA[metacrilato de hexilo]]></kwd>
<kwd lng="es"><![CDATA[modelado]]></kwd>
<kwd lng="es"><![CDATA[polimerización en microemulsión]]></kwd>
<kwd lng="en"><![CDATA[styrene]]></kwd>
<kwd lng="en"><![CDATA[mechanism]]></kwd>
<kwd lng="en"><![CDATA[hexyl methacrylate]]></kwd>
<kwd lng="en"><![CDATA[modeling]]></kwd>
<kwd lng="en"><![CDATA[microemulsion polymerization]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Pol&iacute;meros</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Polimerizaci&oacute;n en microemulsi&oacute;n: construyendo un modelo utilizando la conversi&oacute;n experimental y su derivada</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Microemulsion polymerization: building a model using the experimental conversion and its derivative</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>F. L&oacute;pez&#150;Serrano<sup>1,</sup>*, J. E. L&oacute;pez&#150;Aguilar<sup>1</sup>, E. Mendiz&aacute;bal<sup>2</sup>, J. E. Puig<sup>2</sup> y J. &Aacute;lvarez<sup>3</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Facultad de Qu&iacute;mica. Departamento de Ingenier&iacute;a Qu&iacute;mica. Universidad Nacional Aut&oacute;noma de M&eacute;xico. 04510, M&eacute;xico D. F., M&eacute;xico. *Corresponding author: E&#150;mail: </i><a href="mailto:lopezserrano@correo.unam.mx">lopezserrano@correo.unam.mx</a><i> Tel. (55) 5622&#150;5361 Fax: (55) 5522&#150;5355 </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> CUCEI, Departamentos de Qu&iacute;mica e Ingenier&iacute;a Qu&iacute;mica, Universidad de Guadalajara, 44430, Guadalajara, Jalisco, M&eacute;xico. </i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Departamento de Ingenier&iacute;a de Procesos e Hidr&aacute;ulica., Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa. Apdo. Post. 55&#150;534, 09340, M&eacute;xico D. F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido 19 de Noviembre 2007    <br> Aceptado 3 de Abril 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En este trabajo se propone un modelo basado en conceptos cin&eacute;ticos, termodin&aacute;micos y fisicoqu&iacute;micos y se utiliza un enfoque integrodiferencial (ID) para encontrar los mecanismos fundamentales de la polimerizaci&oacute;n en microemulsi&oacute;n (PME). El procedimiento ID se aplica a datos experimentales de conversi&oacute;n del metacrilato de hexilo (C<sub>6</sub>MA) y del estireno (STY) en la PME. Este procedimiento permiti&oacute; encontrar que: (i) la rapidez de nucleaci&oacute;n no es lineal con el tiempo, contrario a lo reportado con anterioridad, (ii) la coagulaci&oacute;n entre part&iacute;culas es despreciable, (iii) las micelas aportan mon&oacute;mero a las part&iacute;culas reaccionantes, (iv) el efecto v&iacute;treo es importante, aun en pol&iacute;meros con Tg menor a la temperatura de reacci&oacute;n, (v) la entrada de radicales a las part&iacute;culas es despreciable, confirmando propuestas anteriores, (vi) el intervalo de rapidez decreciente de reacci&oacute;n, adem&aacute;s de la disminuci&oacute;n de mon&oacute;mero, se debe a la disminuci&oacute;n de sitios activos, y (vii) un modelo fenomenol&oacute;gico de tres par&aacute;metros es capaz de describir todos los sistemas estudiados.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>estireno, mecanismo, metacrilato de hexilo, modelado, polimerizaci&oacute;n en microemulsi&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A model based on kinetic, thermodynamic and physicochemical concepts, is presented and an integrodifferential approach to find the fundamental events, is used for microemulsion polymerization (MEP). The procedure was applied to experimental conversion data of hexyl methacrylate (C<sub>6</sub>MA) and styrene (STY) in MEP. It was found that: (i) nucleation rate is not linear with time, opposed to previous reports, (ii) coagulation rate is negligible, (iii) micelles provide monomer to reacting particles, (iv) a vitreous effect, even in polymers with a Tg lower than the reaction temperature, was found, (v) radical entry to particles is negligible confirming previous reports, (vi) the decreasing reaction rate interval, besides monomer depletion, is caused by a decrease in active reaction sites, and (vii) a three&#150;parameter phenomenological model is presented capable of describing the studied systems.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>styrene, mechanism, hexyl methacrylate, modeling, microemulsion polymerization.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmiq/v7n1/v7n1a10.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a> </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">La realizaci&oacute;n de este trabajo se llev&oacute; a cabo con el apoyo brindado por los proyectos PAIP (5290&#150;30, FQ UNAM) y PAPIIT (IN101806, UNAM) a trav&eacute;s del otorgamiento de una beca de estudios de licenciatura (JELA) y al programa de intercambio Universidad de Guadalajara/UNAM cuyo soporte es ampliamente agradecido.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Co, C., de Vries, R. y Kaler, E. 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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">Suzuki, K., Nomura, M. y Harada, M. (1999). Kinetics in microemulsion polymerization of styrene. <i>Colloids and Surfaces </i>A: Physiochemical and Engineering Aspects 153 23&#150;30.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8531692&pid=S1665-2738200800010001000017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Co]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[de Vries]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaler]]></surname>
<given-names><![CDATA[E. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Microemulsion polymerization 1. Small-angle neutron scattering study of monomer partitioning]]></article-title>
<source><![CDATA[Macromolecules]]></source>
<year>2001</year>
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