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• W2026739565 abstract "Unbridged zirconocene catalysts, where a seven- or eight-membered ring fused to a cyclopentadiene is associated with a phenyl substituent in position 2 (C7Ph-Zr and C8Ph-Zr), were tested, under the same polymerization conditions, to produce polypropenes with microstructure, molecular properties, and thermal behavior similar to those prepared with (IndPh)2ZrCl2 (w-Zr), the “classical” Waymouth catalyst. Different results were obtained from the homologue titanium catalysts (C7Ph-Ti and C8Ph-Ti) and from the titanium benzyl derivative (C7Bn-Ti), which produced quite heterogeneous materials with broad molecular weight and that can be separated into fractions spanning from completely atactic to fractions characterized by the presence of long isotactic blocks. A quite interesting behavior is observed with the zirconium benzyl derivative C7Bn-Zr, which produces good yields of a polymer with narrow polydispersity, which, despite its rather high isotacticity, shows a hardly detectable melting peak and is completely ether soluble. Quite surprisingly, the same sample, after prolonged annealing, shows a narrow melting peak at low temperature (55−65 °C). This result, together with the X-ray analysis, is in favor of a quite homogeneous material, capable of giving crystallites of small size." @default.
• W2026739565 created "2016-06-24" @default.
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• W2026739565 date "2005-07-20" @default.
• W2026739565 modified "2023-09-23" @default.
• W2026739565 title "Unbridged Zirconium and Titanium Metallocenes with Seven- or Eight-Saturated Fused-Ring Ligands: a Route for the Synthesis of Stereoblock Polypropene" @default.
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• W2026739565 doi "https://doi.org/10.1021/ma050599t" @default.
• W2026739565 hasPublicationYear "2005" @default.
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