Characterization of Polyethylene Nascent Powders Synthesized with TpTiCl 2 (OR) Catalysts

Abstract Summary: Different kinds of polyethylene and ethylene‐1‐hexene copolymers were synthesized with TpTiCl 2 (OR) (Tp = hydrotris(pyrazolyl)borate; R = Et, i‐Pr, n‐Bu) catalysts with and without H 2 . The polymers were characterized by 13 C NMR, capillary viscosimetry or GPC, and DSC. The homop...

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Published inMacromolecular symposia. Vol. 257; no. 1; pp. 131 - 138
Main Authors Casas, Emilio, Karam, Arquímedes, Díaz‐Barrios, Antonio, Albano, Carmen, Sánchez, Yanixia, Méndez, Bernardo
Format Journal Article
LanguageEnglish
Published 01.11.2007
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Summary:Abstract Summary: Different kinds of polyethylene and ethylene‐1‐hexene copolymers were synthesized with TpTiCl 2 (OR) (Tp = hydrotris(pyrazolyl)borate; R = Et, i‐Pr, n‐Bu) catalysts with and without H 2 . The polymers were characterized by 13 C NMR, capillary viscosimetry or GPC, and DSC. The homopolymers showed properties characteristic of ultra‐high molecular weight polyethylenes (UHMWPE) with linear structure and high density polyethylenes (HDPE) with molecular weights in the range of commercial grades under hydrogen atmosphere. The copolymers showed a 1‐hexene incorporation up to 6 mol‐%. Important differences in the thermal properties were observed between the first DSC (nascent powders) and the second DSC heatings (melt‐crystallized samples), which evidenced the molecular weights influence on the melt‐crystallized samples.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.200751112