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- W1532997188 abstract "This chapter examines the performance of metallocene catalysts in the polymerization under high pressure and evaluates the properties of the resulting polymers. Because of their acceptable thermal stability, ansa-metallocenes are suitable catalysts for high pressure polymerization at temperatures fairly above 100o C. Modified silyl-bridged bis(tetrahydroindenyl)zirconocene in toluene is used as the solvent. The cocatalyst is methylaluminoxane (MAO), which was available in a 10 wt% solution in toluene. The polymerization experiments are performed in a continuously operated laboratory unit equipped with a stirred autoclave. The rate of polymerization is determined from the amount of polymer obtained per unit of time. The productivity of the metallocene catalyst is calculated from the quantity of polymer and the catalyst metal fed into the reactor. The resulting polymers are investigated by gel permeation chromatography (GPC) to determine the molecular weight distribution together with the average molecular weights. The density is measured on pressed films by means of the suspension method in a mixture of water and isopropanol. 13C-nuclear magnetic resonance (NMR) spectroscopy is applied to analyze the composition of copolymers and to evaluate their structure." @default.
- W1532997188 created "2016-06-24" @default.
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- W1532997188 date "1996-01-01" @default.
- W1532997188 modified "2023-09-30" @default.
- W1532997188 title "Use of metallocene catalysts in the polymerization under high pressure" @default.
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- W1532997188 doi "https://doi.org/10.1016/s0921-8610(96)80014-8" @default.
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