INFLUENCE OF LIGANDS AND COCATALYST ON THE ACTIVITY IN ETHYLENE POLYMERIZATION OF SOLUBLE TITANIUM COMPLEXES

被引：15

作者：

CONTI, G

ARRIBAS, G

ALTOMARE, A

CIARDELLI, F

机构：

[1] UNIV PISA,DEPT CHEM & IND CHEM,VIA RISORGIMENTA 35,I-56126 PISA,ITALY

[2] CENT UNIV VENEZUELA,FAC CIENCIAS,ESCUELA QUIM,CARACAS,VENEZUELA

来源：

JOURNAL OF MOLECULAR CATALYSIS | 1994年 / 89卷 / 1-2期

关键词：

TITANIUM; ETHYLENE; POLYMERIZATION; ALUMINUM; TRIALKYL; METHYLALUMOXANE;

D O I：

10.1016/0304-5102(93)E0290-W

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Known and new titanium complexes bearing alkoxy, phenoxy, carboxylate and cyclopentadienyl ligands in addition to chlorine have been tested towards ethylene polymerization after activation with aluminum alkyls (AlR3) or methylalumoxane (MAO). In the absence of cyclopentadienyl ligands the optimal productivity obtained is very similar either with AlR3 or MAO, but higher MAO/Ti than AlR3/Ti ratios are necessary. In the case of complexes with the Cp ligand much better productivity can be obtained with high MAO ratios thus confirming that under these conditions a different activation mechanism is operative.

引用

页码：41 / 50

页数：10

共 19 条

[11] (C5ME5)SIME3 AS A MILD AND EFFECTIVE REAGENT FOR TRANSFER OF THE C5ME5 RING - AN IMPROVED ROUTE TO MONOPENTAMETHYLCYCLOPENTADIENYL TRIHALIDES OF THE GROUP-4 ELEMENTS
LLINAS, GH
MENA, M
PALACIOS, F
ROYO, P
SERRANO, R
[J]. JOURNAL OF ORGANOMETALLIC CHEMISTRY, 1988, 340 (01) : 37 - 40
[12] PINO P, 1984, INSECTION POLYM ENCY, V8, P148
[13] ROLE OF TRIMETHYLALUMINUM ON THE ZIRCONOCENE METHYLALUMINOXANE-CATALYZED POLYMERIZATION OF ETHYLENE
REDDY, SS
SHASHIDHAR, G
SIVARAM, S
[J]. MACROMOLECULES, 1993, 26 (05) : 1180 - 1182
[14] OLEFIN POLYMERIZATION AT BIS(PENTAMETHYLCYCLOPENTADIENYL)ZIRCONIUM AND HAFNIUM CENTERS - CHAIN-TRANSFER MECHANISMS
RESCONI, L
PIEMONTESI, F
FRANCISCONO, G
ABIS, L
FIORANI, T
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (03) : 1025 - 1032
[15] GROUP-4 METALLOCENE ALUMOXANE OLEFIN POLYMERIZATION CATALYSTS - CPMAS NMR SPECTROSCOPIC OBSERVATION OF CATION-LIKE ZIRCONOCENE ALKYLS
SISHTA, C
HATHORN, RM
MARKS, TJ
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (03) : 1112 - 1114
[16] SOGA K, 1991, POLYM COMMUN, V32, P310
[17] SOGA K, 1992, MAKROMOL CHEM, V193, P1687
[18] TAKEDA M, 1968, J POLYM SCI C, V23, P741
[19] TSUTSUI T, 1988, POLYM COMMUN, V29, P180

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