Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/327525
Type: Artigo
Title: Alkylammonium Alpo-kanemite As Support For Tuning Catalytic Activity Of Metallocene: In Situ Preparation Of Polyethylene Nanocomposites
Alkylammonium AlPO-kanemite as support for tuning catalytic activity of metallocene: in situpreparation of polyethylene nanocomposites
Author: Ouros, Aline Cristiane dos
Favero, Cristiano
Souza, Michèle Oberson de
Souza, Roberto Fernando de
Pastore, Heloise O.
Abstract: Several alkylammonium-AlPO-kanemites were prepared to display a range of interlayer distances due to the presence of variable n-butyl/n-dodecylammonium concentrations. Zirconocene and titanocene dichlorides reacted with these layered materials to produce new supported metallocene catalysts. The characterization of these materials confirmed their formation and the presence of the anchored metallocene on the solid support. This study aimed to test these samples for the first time as catalysts for ethylene polymerization for verification of the influence of the metallocene supports with tunable inter layer distances on the catalytic behavior and for in situ production of nanocomposites. The data showed that the highly active new supported systems reaches values of activity comparable to that obtained by analogous homogeneous system. The increase in the interlayer space acted to increase the activity, showing that the possibility of change the interlayer space is a tool to control the activity. Polymers obtained by the supported catalysts presented higher molecular weight and lower polydispersities index than that synthetized with homogeneous catalyst. The ethylene polymerization promoted the exfoliation of the alkylammonium-AlPO-kanemite layers in the polymer matrix, characterizing the formation of a nanocomposite. Compared to the pristine polymer, the presence of inorganic fillers in the polymer matrix increased the melting temperature of the nanocomposite. (C) 2016 Elsevier B.V. All rights reserved.
Several alkylammonium-AlPO-kanemites were prepared to display a range of interlayer distances due to the presence of variable n-butyl/n-dodecylammonium concentrations. Zirconocene and titanocene dichlorides reacted with these layered materials to produce
Subject: Nanocomposite
Polyolefin
Metallocene
Layered Material
Aluminophosphate-kanemite
Nanocompósitos (Materiais)
Poliolefinas
Materiais lamelares
Country: Países Baixos
Editor: Elsevier
Citation: Journal Of Molecular Catalysis A: Chemical. Elsevier Science Bv, v. 422, p. 59 - 68, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.molcata.2016.02.009
Address: https://www.sciencedirect.com/science/article/pii/S1381116916300437
Date Issue: 2016
Appears in Collections:IQ - Artigos e Outros Documentos

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