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Ethylene Polymerization Over Ph 2 C ( C p)(2,7‐t‐ B u 2 F lu) Z r C l 2 Supported On SiO 2 ‐MAO
Author(s) -
Casas Emilio,
Paredes Beatriz,
Escola Jose María,
Martin Carlos,
van Grieken Rafael
Publication year - 2013
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201300130
Subject(s) - ethylene , polymerization , chemistry , polymer chemistry , copolymer , catalysis , molecular mass , polymer , organic chemistry , enzyme
Ethylene polymerization over heterogeneous [Ph 2 C(Cp)(2,7‐t‐Bu 2 Flu)ZrCl 2 ] supported on SiO 2 ‐MAO is studied. The influence of the main reaction variables is determined in ethylene homopolymerization: TEA concentration (88–702 ppm), temperature (55–85 °C) and pressure (3–12 bar). An optimum in the catalytic activity is achieved at TEA a concentration of 351 ppm, 85 °C and 8 bar of ethylene. At this ethylene pressure, all the polyethylenes show molecular weights above 400 000 g · mol −1 . Using hydrogen as transfer agent, the activity is distinctly lower but it is possible to attain molecular weights below 40 000 g · mol −1 . Regarding 1‐butene, it is observed good catalytic response in copolymerization, observing remarkable activities, higher than those obtained in homopolymerization.