ISSN:
1022-1336
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Silica supported (butylcyclopentadienyl)2ZrCl2/MAO catalysts were synthesized according to the “incipient wetness” method from a solution of metallocene in a liquid monomer. The monomer was allowed to polymerize yielding a catalyst containing polyhexene (PH), polystyrene (PS) or polyoctadiene (PO). One catalyst containing no polymer was also synthesized. The catalysts were used to polymerize ethene at 70°C and 4 bar total pressure. The measured average activities were 5 300 kg PE/(mol Zr · h) for (BuCp)2ZrCl2/MAO/PH/SiO2, 8 600 kg PE/(mol Zr · h) for (BuCp)2ZrCl2/MAO/PS/SiO2, 3 400 kg PE/(mol Zr · h) for (BuCp)2ZrCl2/MAO/PO/SiO2 and 5 700 kg PE/(mol Zr · h) for (BuCp)2ZrCl2/MAO/SiO2. The polyhexene, polystyrene or polyoctadiene in the catalyst forms a protective layer around the active sites. Even after exposure to air for five hours these catalysts retain some polymerization activity.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
