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- W2023652072 abstract "The catalyst precursors TpMs*V(L)Cl2 [1, L = NtBu; 2, L = O; TpMs* = (3-mesityl-pirazolyl)2(5-mesityl-pirazolyl)] were in situ supported onto SiO2 and onto methylaluminoxane (SMAO-4) and trimethylaluminum (STMA-3) modified silicas using 0.02 wt.% V/support. All catalyst systems were shown to be active in ethylene polymerization, with activities lying between 1000 and 1900 kg of PE/mol [V] h atm. Similar activities were found by employing different types of cocatalysts (MAO, TMA, and IPRA) in the in situ polymerization reaction using 1/SMAO-4. Furthermore, the systems were shown to be stable at different [Al]/[V] molar ratios and polymerization temperatures. Polyethylenes were characterized by differential scanning calorimetry (DSC). The impossibility of dissolving them in a common solvent for GPC analysis suggests that such polymers might present very high molecular weights." @default.
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- W2023652072 date "2006-08-01" @default.
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- W2023652072 title "Ethylene polymerization using tris(pyrazolyl)borate vanadium (V) catalysts in situ supported on MAO-modified silica" @default.
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- W2023652072 doi "https://doi.org/10.1016/j.molcata.2006.03.062" @default.
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