<?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>1405-7743</journal-id>
<journal-title><![CDATA[Ingeniería, investigación y tecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. invest. y tecnol.]]></abbrev-journal-title>
<issn>1405-7743</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-77432017000300245</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Propiedades termo-mecánicas del Polipropileno: Efectos durante el reprocesamiento]]></article-title>
<article-title xml:lang="en"><![CDATA[Thermo-mechanical properties of polypropylene: Effects during reprocessing]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caicedo]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crespo-Delgado]]></surname>
<given-names><![CDATA[Lina Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Rodríguez]]></surname>
<given-names><![CDATA[Hever de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Jaramillo]]></surname>
<given-names><![CDATA[Norman Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Nacional de Asistencia Técnica a la Industria Servicio Nacional de Aprendizaje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Nacional de Asistencia Técnica a la Industria Servicio Nacional de Aprendizaje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Nacional de Asistencia Técnica a la Industria Servicio Nacional de Aprendizaje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro Nacional de Asistencia Técnica a la Industria Servicio Nacional de Aprendizaje ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>18</volume>
<numero>3</numero>
<fpage>245</fpage>
<lpage>252</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432017000300245&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432017000300245&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432017000300245&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este trabajo se llevó a cabo la transformación del copolímero al azar a base de polipropileno mediante la técnica de inyección. Se establecieron las variables que corresponden a temperatura, presión, velocidad y tiempo de residencia para el proceso del material virgen. Posteriormente, se obtuvieron cinco generaciones bajo las mismas condiciones de proceso con el objeto de estudiar las propiedades térmicas y mecánicas del mismo, que permitió relacionar los cambios debidos a la termoxidación del material. Los resultados de los análisis correspondientes a la caracterización mecánica presentaron disminución hasta 6.0% para flexión y 8.4% para tracción. Por otra parte, los resultados térmicos mostraron 13.6% de pérdida en la quinta generación, respecto al material virgen en el experimento de procesamiento con la inyectora, mientras que para el proceso de simulación térmica la pérdida fue de 3.8%. Esta simulación consideró como parámetros: la temperatura máxima, el tiempo de residencia y el número de ciclos de proceso. Este análisis térmico permitió cuantificar los efectos asociados a la fricción como resultante de los esfuerzos mecánicos de corte y compresión.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this work a transformation of random polypropylene copolymer by injection technique was carried out. For the virgin material process the corresponding variables such as temperature, pressure, velocity and residence time were established. In order to study the thermal and mechanical properties of this system. Five more generations were obtained, which allowed us to correlate the changes caused by the material thermal oxidation. The results of mechanical characterization corresponding to the analysis presented to decrease in 6.0%, for bend and 8.4% for traction. On the other hand, the thermal results showed a 13.6% loss on the fifth generation regarding the virgin material on the injection experiment; meanwhile for the thermal simulation this loss was minimal with a 3.8%. For the simulation three parameters were considered: maximum temperature, residence time and the number of cycles in the process. The thermal analysis allowed us to quantify the friction associated effects as a result of the mechanical shear and compression.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Polipropileno]]></kwd>
<kwd lng="es"><![CDATA[inyección]]></kwd>
<kwd lng="es"><![CDATA[análisis térmico]]></kwd>
<kwd lng="es"><![CDATA[reproceso]]></kwd>
<kwd lng="es"><![CDATA[propiedades mecánicas]]></kwd>
<kwd lng="en"><![CDATA[Polypropylene]]></kwd>
<kwd lng="en"><![CDATA[injection]]></kwd>
<kwd lng="en"><![CDATA[thermal analysis]]></kwd>
<kwd lng="en"><![CDATA[reprocess]]></kwd>
<kwd lng="en"><![CDATA[mechanical properties]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bahlouli]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recycling effects on the rheological and thermomechanical properties of polypropylene-based composites]]></article-title>
<source><![CDATA[Materials and Design]]></source>
<year>2012</year>
<volume>33</volume>
<page-range>451-8</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bledzki]]></surname>
<given-names><![CDATA[A.K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Polypropylene biocomposites reinforced with softwood, abaca, jute, and kenaf fibers]]></article-title>
<source><![CDATA[Industrial Crops and Products]]></source>
<year>2015</year>
<volume>70</volume>
<page-range>91-9</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brenner]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Polypropylene an alternative?]]></article-title>
<source><![CDATA[Kunststoffe]]></source>
<year>2000</year>
<volume>4</volume>
<page-range>35</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Da Costa]]></surname>
<given-names><![CDATA[H.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[V.D.]]></given-names>
</name>
<name>
<surname><![CDATA[De Oliveira]]></surname>
<given-names><![CDATA[M.G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Degradation of polypropylene (PP) during multiple extrusions: Thermal analysis, mechanical properties and analysis of variance]]></article-title>
<source><![CDATA[Polymer Testing]]></source>
<year>2007</year>
<volume>26</volume>
<page-range>676-84</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dilán]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Técnicas modernas de moldeo]]></source>
<year>2002</year>
<publisher-name><![CDATA[Moldeo UniversalTM]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[J.G]]></given-names>
</name>
<name>
<surname><![CDATA[Neira-Velazquez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Angulo-Sanchez]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Polypropylene chain scissions and molecular weight changes in multiple extrusion]]></article-title>
<source><![CDATA[Polym Degrad Stab]]></source>
<year>1998</year>
<volume>60</volume>
<numero>1</numero>
<issue>1</issue>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harutun]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Handbook of Polypropylene and Polypropylene composites]]></source>
<year>2003</year>
<edition>2a</edition>
<page-range>10-29</page-range><publisher-name><![CDATA[CRC Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hermanová]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Tochácek]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Jancár]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kalfus]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of multiple extrusion on molecular structure of polypropylene impact copolymer.]]></article-title>
<source><![CDATA[Polymer Degradation and Stability]]></source>
<year>2009</year>
<volume>94</volume>
<page-range>1722-7</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hoffman]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Polyprpylene beginning to show signs of strength]]></article-title>
<source><![CDATA[Chemical market Reporter]]></source>
<year>2002</year>
<page-range>8</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kang]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Lu]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Xu]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Properties of immiscible and ethylene-butyl acrylate-glycidyl methacrylate terpolymer compatibilized poly (lactic acid) and polypropylene blends]]></article-title>
<source><![CDATA[Polymer Testing]]></source>
<year>2015</year>
<volume>43</volume>
<page-range>173-81</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<collab>Market Study</collab>
<source><![CDATA[Polypropylene]]></source>
<year>2013</year>
<edition>3</edition>
<publisher-name><![CDATA[Ceresana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muccio]]></surname>
<given-names><![CDATA[E.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Plastics Processing Technology]]></source>
<year>1994</year>
<page-range>152-3</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Papageorgioua]]></surname>
<given-names><![CDATA[D.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Bikiaris]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Chrissafis]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of crystalline structure of polypropylene random copolymers on mechanical properties and thermal degradation kinetics]]></article-title>
<source><![CDATA[Thermochimica Acta]]></source>
<year>2012</year>
<volume>543</volume>
<page-range>288-94</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Thakur]]></surname>
<given-names><![CDATA[V.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Vennerberg]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Kessler]]></surname>
<given-names><![CDATA[M.R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Green aqueous surface modification of polypropylene for novel polymer nanocomposites]]></article-title>
<source><![CDATA[ACS Appl. Mater. Interfaces]]></source>
<year>2014</year>
<volume>6</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>9349-56</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shroff]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mavridis]]></surname>
<given-names><![CDATA[H. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[New measures of polydispersity from rheological data on polymer melts.]]></article-title>
<source><![CDATA[J. Appl. Polym. Sci.]]></source>
<year>1995</year>
<volume>57</volume>
<numero>13</numero>
<issue>13</issue>
<page-range>1605-26</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
