%0 Journal Article
%T Influ¨ºncia do agente de clora£¿£¿o do catalisador ¨¤ base de veod¨ªmio e da raz£¿o molar Cl: Nd na polimeriza£¿£¿o do butadieno
%A Ferreira
%A Cintia N.
%A Mello
%A Ivana L.
%A Coutinho
%A Fernanda M. B.
%J Pol¨ªmeros
%D 2009
%I Associa??o Brasileira de Pol¨ªmeros
%R 10.1590/S0104-14282009000200011
%X in this work catalyst systems consisting of diisobutylaluminium hydride (dibah), neodymium versatate (ndv) and a chlorinating agent were employed to study the influence of the chloride source and cl:nd molar ratio on 1,3-butadiene polymerization and polybutadiene's characteristics (molecular weight and microstructure). the chloride sources studied were t-butyl chloride, ethylaluminium sesquichloride (easc) and diethylaluminium chloride (deac). the cl:nd molar ratios used were 1:1, 3:1 e 5:1 for t-butyl chloride; 0.5:1, 1:1 and 3:1 for easc and 1:1, 1.5:1, 3:1 and 5:1 for deac. a maximum value of cl:nd molar ratio exists. moreover, deac showed to be more reactive than easc and t-bucl but t-bucl produced higher molecular weight and cis-1,4 units contents.
%K ziegler-natta catalysts
%K neodymium
%K chlorinating agent
%K high cis-polybutadiene.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0104-14282009000200011&lng=en&nrm=iso&tlng=en