PREPARATION OF NANOCOMPOSITES BY IN SITU POLIMERIZATION

dc.creatorZAPATA,PAULA
dc.creatorQUIJADA,RAÚL
dc.creatorRETUER,JAIME
dc.creatorMONCADA,EDWIN
dc.date2008-03-01
dc.date.accessioned2017-03-07T16:01:34Z
dc.date.available2017-03-07T16:01:34Z
dc.identifierhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000100006
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/394791
dc.descriptionPolyethylene nanocomposites were obtained by in situ polymerization using both montmorillonite (natural clay) and montmorillonite organically modified with octadecylamine (O-Clo). In this proposed methodology the clays were added directly in the reactor together with the catalytic system (metallocene catalyst and methylaluminoxane) and ethylene. The nanocomposites were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM), and by tensile stress-strain tests. It was found that the catalytic activity increased around 20% when natural clay was used compared with the standard polymer. But when modified clay was used the catalytic activity did not show important changes. On the other hand, XRD and TEM showed that the clays are in a disordered state and well dispersed in the polyethylene matrix. Finally, the nanocomposites showed an increase of about 30% in Young's modulus compared with the standard polymer
dc.formattext/html
dc.languageen
dc.publisherSociedad Chilena de Química
dc.sourceJournal of the Chilean Chemical Society v.53 n.1 2008
dc.subjectNanocomposites
dc.subjectMontmorillonite
dc.subjectPolyethylene
dc.subjectMetallocene
dc.titlePREPARATION OF NANOCOMPOSITES BY IN SITU POLIMERIZATION
dc.typeArtículos de revistas


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