%0 Journal Article
%T UHMWPE-layered silicate nanocomposites by in situ polymerization with tris(pyrazolyl)borate titanium/clay catalyst
%A Junges
%A Fernando
%A Beauvalet
%A Mariana S.
%A Leal
%A B¨¢rbara C.
%A Casagrande
%A Adriana C. A.
%A Mota
%A F¨¢bio F.
%A Mauler
%A Raquel S.
%A Casagrande Jr
%A Osvaldo L.
%J Journal of the Brazilian Chemical Society
%D 2009
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532009000300010
%X polyethylene-mmt nanocomposites were prepared by in situ polymerization methodology using tpms*ticl3 (1) intercalated into the gallery of cloisite£¿ 30b (c30b) using methylaluminoxane (mao) as activator. from the powder x-ray diffraction (xrd) analysis it was observed that the basal spacing of the activated organoclay changes from 1.85 nm (2¦È = 4.8) to 2.18 nm (2¦È = 4.0) indicating that the intercalation of the titanium catalyst into the gallery took place. the catalytic system 1/c30b/mao was active in the ethylene polymerization under different reaction conditions. the exfoliated morphology of the pe-mmt nanocomposite was further examined and confirmed by x-ray diffraction (xrd) and transmission electron microscopy (tem) analysis. the presence of exfoliated clay (5 wt.%) in the pe matrix confers better mechanical properties (flexural modulus and storage modulus) when compared with the ones displayed by the neat pe produced using exclusively 1.
%K clay
%K uhmwpe
%K nanocomposites
%K titanium catalyst.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532009000300010&lng=en&nrm=iso&tlng=en