Artículo de revista
Preparation of nanocomposites by in situ polimerization
Fecha
2008-03Registro en:
JOURNAL OF THE CHILEAN CHEMICAL SOCIETY, Volume: 53, Issue: 1, Pages: 1358-1360, 2008
0717-9324
Autor
Zapata, Paula
Quijada Abarca, Juan
Retuert de la Torre, Pedro Jaime
Moncada, Edwin
Institución
Resumen
Polyethylene 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