<?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>0187-893X</journal-id>
<journal-title><![CDATA[Educación química]]></journal-title>
<abbrev-journal-title><![CDATA[Educ. quím]]></abbrev-journal-title>
<issn>0187-893X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Química]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-893X2016000200097</article-id>
<article-id pub-id-type="doi">10.1016/j.eq.2015.11.001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El crecimiento en los extremos: reactividad de grupos terminales en polímeros para la síntesis de copolímeros bloque]]></article-title>
<article-title xml:lang="en"><![CDATA[Growth in the end-groups: Reactivity of terminal groups in polymers to the synthesis of block copolymers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Báez]]></surname>
<given-names><![CDATA[José E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Guanajuato Departamento de Química ]]></institution>
<addr-line><![CDATA[Guanajuato ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>27</volume>
<numero>2</numero>
<fpage>97</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2016000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2016000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2016000200097&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Tres diferentes tipos de reacciones utilizando grupos terminales en polímeros fueron analizados para la síntesis de copolímeros dibloque, tales como: a) los grupos azida (R-N3) y el alquino (R-C&#8801;CH) para obtener una cicloadición 1,3-dipolar (química clic); b) los polímeros &#945;,&#969;&#8722;hidoxi-telequélicos (HO-R-OH) y los diisocianatos (OCN-R-NCO) para sintetizar poliuretanos por policondensación y c) los halogenuros de alquilo (R-Cl o R-Br) para preparar copolímeros bloque derivados del poliestireno por polimerización radical por transferencia de átomos (ATRP).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Three different cases of reactions using end-groups in polymers were analyzed for the synthesis of block copolymers, such as: a) azide (R-N3) and alkine (R-C&#8801;CH) end groups to obtain a 1,3-dipolar cycloaddition (click chemistry), b) &#945;,&#969;-hydroxy telechelic polymers (HO-R-OH) and diisocyanates (OCN-R-NCO) to synthesize polyurethanes by polycondesation and c) alkyl halides (R-Cl or R-Br) to prepare block copolymers derived of polystyrene by atom transfer radical polymerization (ATRP).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Copolímero bloque]]></kwd>
<kwd lng="es"><![CDATA[Grupo terminal]]></kwd>
<kwd lng="es"><![CDATA[Química clic]]></kwd>
<kwd lng="es"><![CDATA[Poliuretano]]></kwd>
<kwd lng="es"><![CDATA[Polimerización radical por transferencia de átomo]]></kwd>
<kwd lng="en"><![CDATA[Block copolymer]]></kwd>
<kwd lng="en"><![CDATA[End-group]]></kwd>
<kwd lng="en"><![CDATA[Click chemistry]]></kwd>
<kwd lng="en"><![CDATA[Polyurethane]]></kwd>
<kwd lng="en"><![CDATA[Atom transfer radical polymerization (ATRP)]]></kwd>
</kwd-group>
</article-meta>
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