Copolymerization behavior of Cp2ZrCl2/MAO and [(CO)5WC(Me)OZrCp2Cl]/MAO: a comparative study on ethylene/1-pentene copolymers

Autor:	Lars-Christian Heinz, Helgard G. Raubenheimer, Robert Brüll, Nyambeni Luruli, Harald Pasch, Valérie Grumel
Rok vydání:	2006
Předmět:	Ethylene Polymers and Plastics Organic Chemistry Nuclear magnetic resonance spectroscopy Fractionation law.invention chemistry.chemical_compound chemistry Pentene law Polymer chemistry Materials Chemistry Copolymer Molar mass distribution Crystallization Metallocene
Zdroj:	Polymer. 47:56-66
ISSN:	0032-3861
Popis:	Ethylene/1-pentene copolymers were synthesized using Cp 2 ZrCl 2 ( 1 )/MAO and [(CO) 5 W C(Me)OZr(Cp) 2 Cl]( 2 )/MAO catalyst systems. The copolymers were characterized by SEC, DSC, FTIR and 13 C NMR spectroscopy. The copolymers synthesized with [(CO) 5 W C(Me)OZr(Cp) 2 Cl]( 2 )/MAO had higher average molecular weights and broader polydispersities compared to those produced with Cp 2 ZrCl 2 ( 1 )/MAO. The chemical heterogeneity was investigated by SEC-FTIR and fractionation techniques. All copolymers showed a higher incorporation of the 1-pentene in the low molecular weight fraction as revealed by SEC-FTIR. Crystallization analysis fractionation (CRYSTAF) showed a broad chemical composition distribution (CCD) for all the copolymers synthesized with these two catalyst systems. Selected copolymers were also analyzed using an automated preparative molecular weight fractionation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c21388c31c9ea30a05a8eaab16466127 https://doi.org/10.1016/j.polymer.2005.11.042 Zobrazit plný text záznamu Full Text from ScienceDirect