<?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>0120-2804</journal-id>
<journal-title><![CDATA[Revista Colombiana de Química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Quim.]]></abbrev-journal-title>
<issn>0120-2804</issn>
<publisher>
<publisher-name><![CDATA[Departamento de Química,  Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28042018000300005</article-id>
<article-id pub-id-type="doi">10.15446/rev.colomb.quim.v47n3.69280</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio de la capacidad de absorción en hidrogeles semi-interpenetrados de poliacrilamida/poli(hidroxibu tirato-co-hidroxivalirato)]]></article-title>
<article-title xml:lang="en"><![CDATA[Study of the absorption capacity in semi-interpenetrating hydrogels of polyacrylamide/poly(hydro xybutyrate-co-hydroxy valerate)]]></article-title>
<article-title xml:lang="pt"><![CDATA[Estudo da capacidade de absorção em hidrogéis semi-interpenetrados de poliacrila mida/poli(hidroxibutirato-co-hidroxivalerato)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Nain]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[El-Halah]]></surname>
<given-names><![CDATA[Amai]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras]]></surname>
<given-names><![CDATA[Jesús M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gascue]]></surname>
<given-names><![CDATA[Blanca Rojas de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Magdalena Facultad de Ciencias Básicas ]]></institution>
<addr-line><![CDATA[Santa Marta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Los Andes Dpto. de Química, Grupo de polímeros ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Oriente (UDO) Instituto de Investigaciones en Biomedicina y Ciencias Aplicadas ]]></institution>
<addr-line><![CDATA[ Sucre]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>47</volume>
<numero>3</numero>
<fpage>5</fpage>
<lpage>12</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28042018000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28042018000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28042018000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se sintetizaron hidrogeles semi-interpenetrados (semi-IPN) obtenidos a partir de acrilamida (AAm) y el biopolímero poli(hidroxibutirato-co-hidroxivalerato) (P(HB-co-HV)) de diferente masa molar (Mv). El análisis de la estructura química de los materiales se realizó mediante espectroscopia FT-IR. Los resultados sugirieron la incorporación del P(HB-co-HV) dentro de la red entrecruzada de la poliacrilamida (PAAm), lo que indicó que el hidrogel semi-IPN fue sintetizado. Adicionalmente, se analizaron muestras del gel seco semi-IPN a través de calorimetría diferencial de barrido. Se siguió gravimétricamente el comportamiento de hinchamiento de los hidrogeles en agua y se analizó el efecto de la composición porcentual y del porcentaje de reactivo entrecruzante (N,N'-metilenbisacrilamida, MBAAm) sobre los mecanismos de transporte de agua. Los resultados obtenidos indicaron que los hidrogeles semi-IPN se hinchan menos que el hidrogel de PAAm pura, lo que se atribuyó al carácter hidrófobo del biopolímero incorporado dentro de la red entrecruzada del material. Se calculó el exponente de difusión de los hidrogeles (n) y en todos los casos se obtuvo que n &lt; 0,50. Por tanto, el proceso de difusión es menos Fickiano, lo que significa que la rapidez de penetración del agua es mucho menor que la velocidad de relajación de las cadenas de polímero.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Semi-interpenetrated hydrogels (semi-IPN) obtained from acrylamide (AAm) and the biopolymer poly(hydroxybutyrate-co-hydroxyvalerate) (P(HB-co-HV)) of different molar mass (Mv) were synthesized. Chemical structure of the synthesized materials was analyzed by using FT-IR spectroscopy. The results suggested the incorporation of P(HB-co-HV) within the cross-linked network of the Polyacrylamide (PAAm), which indicated that the semi-IPN hydrogel was synthesized. To confirm this result, semi-IPN dry gel samples were analyzed by differential scanning calorimetry. The swelling behavior of the hydrogels in water was followed gravimetrically and the effect of the percentage composition and percentage of crosslinking reagent (N,N'-methylenebisacrylamide, MBAAm) on the water transport mechanisms was analyzed. Results indicated that the semi-IPN hydrogels swell less than the PAAm hydrogel alone, which was attributed to the hydrophobic nature of the biopolymer incorporated within the crosslinked network of the material. Additionally, the diffusion exponent of the hydrogels (n) was calculated and in all cases, the obtained result was n &lt; 0.50. This fact shows that the diffusion process is less Fickian, which means that the speed of water penetration is lower than the speed of relaxation of the polymer chain.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Foram sintetizados hidrogéis semi-interpenetrados (semi-IPN) obtidos a partir de acrilamida (AAm) e biopolímero poli(hidroxibutirato-co-hidroxivalerato) (P(HB-co-HV)) de diferente peso molecular (Mv). Os resultados da análise da estrutura química do material foram feitos por espectroscopia FT-IR. Os resultados sugerem à adição do P(HB-co-HV) no interior da rede de ligações cruzadas de poliacrilamida (PAAm), isto indica que o hidrogel semi-IPN foi sintetizado. Este resultado foi confirmado, por meio da análise de amostras de calorimetria diferencial de varredura do gel seco semi-IPN. O comportamento do inchamento dos hidrogéis na água foi seguido pela gravimetria e foi analisado o efeito da composição percentual e a percentagem de reagente de ligação cruzada (N,N'-metilenobisacrilamida, MBAAm) sobre o mecanismo de transporte de água. Os resultados indicam que os hidrogéis semi-IPN incham-se menos do que o hidrogel da PAAm pura. Este comportamento foi atribuído ao carácter hidrofóbico incorporado no material do biopolímero incorporado dentro da rede de ligações cruzadas. O expoente de difusão dos hidrogéis (n) foi calculado, e em todos os casos foi obtido que n &lt; 0,50. Então o processo de difusão é menos Fickiano, o que significa que a velocidade de penetração da água é muito mais baixa do que a taxa de relaxamento da cadeia de polímero.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[redes semi-interpenetradas]]></kwd>
<kwd lng="es"><![CDATA[hidrólisis]]></kwd>
<kwd lng="es"><![CDATA[biopolímero]]></kwd>
<kwd lng="es"><![CDATA[cinética]]></kwd>
<kwd lng="en"><![CDATA[interpenetrated networks]]></kwd>
<kwd lng="en"><![CDATA[hydrolysis]]></kwd>
<kwd lng="en"><![CDATA[biopolymer]]></kwd>
<kwd lng="en"><![CDATA[kinetic]]></kwd>
<kwd lng="pt"><![CDATA[redes semi-interpenetrantes]]></kwd>
<kwd lng="pt"><![CDATA[hidrólise]]></kwd>
<kwd lng="pt"><![CDATA[biopolímero]]></kwd>
<kwd lng="pt"><![CDATA[cinética]]></kwd>
</kwd-group>
</article-meta>
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