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Thermal Behavior and Structural Features of Propene/1-Pentene Copolymers by Metallocene Catalysts

✍ Scribed by Giovanna Costa; Paola Stagnaro; Vincenzo Trefiletti; Maria Carmela Sacchi; Fabrizio Forlini; Giovanni Carlo Alfonso; Ioan Tincul; Udo M. Wahner

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
114 KB
Volume
205
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Two families of propene/1‐pentene copolymers prepared with different isospecific metallocene catalysts, rac‐Et(Ind)~2~ZrCl~2~ and rac‐Me~2~Si(2‐MeBenz‐[e]Ind)~2~ZrCl~2~, containing increasing amounts of 1‐pentene were studied by differential scanning calorimetry (DSC) and wide angle X‐ray diffraction (WAXD). The thermal behavior of the copolymers was correlated with their microstructural features and a relationship between melting temperatures and average length of the isotactic sequences was established. Furthermore, the influence of the comonomer on the degree and type of crystallinity of the copolymers was investigated. Preliminary WAXD results demonstrate that only the α‐modification is present when crystallization takes place under fast cooling conditions, both in crystallized samples as well as in samples that had been aged for several weeks at room temperature.

Melting temperatures of endotherm I vs. the calculated n~iso~ values for the two series of propene/1‐pentene copolymers and the corresponding polypropenes.

imageMelting temperatures of endotherm I vs. the calculated n~iso~ values for the two series of propene/1‐pentene copolymers and the corresponding polypropenes.

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