<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2016000300141</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Influence of co-catalyst in the Polymerization of 1,3-butadiene Catalyzed by Neodymium Chloride Tripentanolate]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia López]]></surname>
<given-names><![CDATA[Luis Alexandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enríquez-Medrano]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado Textle]]></surname>
<given-names><![CDATA[Hortensia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soriano Corral]]></surname>
<given-names><![CDATA[Florentino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López González]]></surname>
<given-names><![CDATA[Héctor Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[St Thomas]]></surname>
<given-names><![CDATA[Claude]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Gámez]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivares Romero]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz de León Gómez]]></surname>
<given-names><![CDATA[Ramón Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Freiburg  ]]></institution>
<addr-line><![CDATA[Freiburg im Breisgau ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación en Química Aplicada  ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Ecología A.C. Red de Estudios Moleculares Avanzados Campus III ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>60</volume>
<numero>3</numero>
<fpage>141</fpage>
<lpage>147</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2016000300141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2016000300141&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2016000300141&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Triisobutylaluminum (TIBA), triethylaluminum (TEA), diisobutylaluminum hydride (DIBAH) and methylaluminoxane (MAO) were evaluated as activators of neodymium chloride tripentanolate catalyst in order to investigate their influence over the catalytic activity, macro- and microstructure, and thermal properties of of resulting polybutadienes. The higher catalytic activities were achieved by TEA and TIBA as co-catalysts, whereas TIBA and DIBAH led to the polymers with highest cis-1,4 structure content with 98.4 and 97.3% respectively. The catalytic activity was remarkably poor with MAO as co-catalyst, as well as low stereocontrol. Number average molecular weight values were observed in the range of 260 to 720 kg/mol.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Triisobutilaluminio (TIBA), trietilaluminio (TEA), hidruro de diisobutilaluminio y metil aluminoxano (MAO) fueron evaluados como activadores del catalizador tricloruro de neodimio tripentanolato en la polimerización de 1,3-butadieno. Se determinó la influencia de los sistemas catalíticos sobre la actividad catalítica, microestructura, macro-estructura y propiedades térmicas de los polímeros resultantes. La mayor actividad catalítica fue observada cuando TEA y TIBA fueron empleados. Por su parte, TIBA y DIBAH dieron lugar a la obtención de polibutadienos con el mayor contenido de microestructura cis-1,4, con 98.4 y 97.3% respectivamente. La actividad catalítica fue marcadamente pobre al utilizar MAO quién condujo además a un bajo estereocontrol. Los pesos moleculares promedio en número fueron observados en el rango de 260 a 720 kg/mol.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Coordination polymerization]]></kwd>
<kwd lng="en"><![CDATA[catalyst system]]></kwd>
<kwd lng="en"><![CDATA[neodymium]]></kwd>
<kwd lng="en"><![CDATA[aluminum co-catalyst]]></kwd>
<kwd lng="en"><![CDATA[1,3-butadiene]]></kwd>
<kwd lng="es"><![CDATA[Polimerización por coordinación]]></kwd>
<kwd lng="es"><![CDATA[sistema catalítico]]></kwd>
<kwd lng="es"><![CDATA[neodimio]]></kwd>
<kwd lng="es"><![CDATA[co-catalizador de aluminio]]></kwd>
<kwd lng="es"><![CDATA[1,3-butadieno]]></kwd>
</kwd-group>
</article-meta>
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