Vanadium-based Ziegler-Natta catalyst supported on MgCl2(THF)(2) for ethylene polymerization

被引:51
作者
Czaja, K
Bialek, M
机构
[1] University of Opole, Institute of Chemistry, 45-052 Opole
关键词
D O I
10.1002/marc.1996.030170407
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A supported magnesium-vanadium-aluminium catalyst was prepared by depositing with the use of a milling technique - VOCl3 on the MgCl3(THF)(2) support and subsequent activation with diethylaluminium chloride. Catalytic activity of the obtained system for ethylene polymerization was evaluated as a function of Mg/V and Al/V ratios as well as catalyst ageing time and polymerization temperature. High concentrations of THF in the catalytic system and considerable excess of an organoaluminium co-catalyst were found to have no deactivating action on vanadium active sites. The catalyst obtained is stable and its activity for ethylene polymerization is high. It yields polyethylene with higher molecular weight and higher melting point than offered by the materials produced with the use of a corresponding unsupported vanadium catalyst or a titanium-based system on the same magnesium support. Kinetic investigations confirmed stability of this catalyst irrespective of its concentration in the polymerization medium or of monomer concentration. Moreover, analysis of the kinetic findings revealed that over 80% of vanadium employed forms active polymerization sites.
引用
收藏
页码:253 / 260
页数:8
相关论文
共 18 条
[1]   POLYMERIZATION OF ETHYLENE AT HIGH-TEMPERATURE BY VANADIUM-BASED HETEROGENEOUS ZIEGLER-NATTA CATALYSTS .1. STUDY OF THE DEACTIVATION PROCESS [J].
ADISSON, E ;
DEFFIEUX, A ;
FONTANILLE, M .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1993, 31 (03) :831-839
[2]   POLYMERIZATION OF ETHYLENE AT HIGH-TEMPERATURE BY VANADIUM-BASED HETEROGENEOUS ZIEGLER-NATTA CATALYSTS .2. STUDY OF THE ACTIVATION BY HALOCARBONS [J].
ADISSON, E ;
DEFFIEUX, A ;
FONTANILLE, M ;
BUJADOUX, K .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1994, 32 (06) :1033-1041
[3]  
DEFFIEUX A, 1994, POLIMERY, V39, P585
[4]   OLEFIN POLYMERIZATION BY VANADIUM-CONTAINING SILSESQUIOXANES - SYNTHESIS OF A DIALKYL OXO VANADIUM(V) COMPLEX THAT INITIATES ETHYLENE POLYMERIZATION [J].
FEHER, FJ ;
BLANSKI, RL .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (14) :5886-5887
[5]  
HOSADA S, 1983, POLYM J, V20, P383
[6]   USE OF V AND V-CR CATALYSTS INTERCHANGED IN Y-ZEOLITES FOR THE POLYMERIZATION OF ETHYLENE [J].
ISMAYEL, A ;
ARRIBAS, G ;
CELTA, D ;
SANCHEZ, G .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1994, 32 (08) :1539-1542
[7]  
KISSIN YV, 1985, ISOSPECIFIC POLYM OL, P332
[8]   COPOLYMERIZATION OF ETHENE AND PROPENE IN LIQUID PROPENE WITH MGCL2/TICL4, VOCL3 AND CP2ZRCL2 CATALYST SYSTEMS - A COMPARISON OF PRODUCTS [J].
KOIVUMAKI, J ;
SEPPALA, JV .
EUROPEAN POLYMER JOURNAL, 1994, 30 (10) :1111-1115
[9]   CHARACTERIZATION OF VANADIUM-BASED OLEFIN POLYMERIZATION CATALYST PRECURSORS BY SOLID-STATE V-51-NMR [J].
MCFADDIN, D ;
REINKING, M .
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1995, 33 (03) :563-570
[10]   SYNTHESIS, STRUCTURE, AND HOMOGENEOUS CATALYTIC ACTIVITY OF THE NOVEL (CYCLOSILOXY)OXOVANADIUM(IV) COMPLEX VO(O(SIPH2O)2)2-MU-(LI(THF)2)2 [J].
MOTEVALLI, M ;
SHAH, D ;
SHAH, SAA ;
SULLIVAN, AC .
ORGANOMETALLICS, 1994, 13 (10) :4109-4112