Zirconocene catalyst well spaced inside modified montmorillonite for ethylene polymerization: role of pretreatment and modification of montmorillonite in tailoring polymer properties

被引：38

作者：

Liu, CB ^{[1
]}

Tang, T ^{[1
]}

Huang, BT ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2004年 / 221卷 / 01期

基金：

中国国家自然科学基金;

关键词：

montmorillonite; zirconocene; polyethylene; molecular weight; molecular weight distribution; chemical composition;

D O I：

10.1016/j.jcat.2003.08.013

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：

Zirconocene catalyst was heterogenized inside an organosilane-modified montmorillonite (MMT) pretreated by calcination and acidization, for supported catalyst systems with well-spaced alpha-olefin polymerization active centers. The varied pretreatment and modification conditions of montmorillonite are efficient for supported zirconocene catalysts in control of polyethylene microstructures, in particular, molecular weight distribution. In contrast to other supported catalyst systems, Cp2ZrCl2/modified montmorillonite(MMT-7)-supported catalysts with a distinct interlayer structure catalyzed ethylene homopolymerization and copolymerization with I-octene activated by methylaluminoxane (MAO), resulting in polymers with a bimodal molecular weight distribution (MWD). (C) 2003 Elsevier Inc, All rights reserved.

引用

页码：162 / 169

页数：8

共 46 条

[1] Syntheses of polysiloxane-supported zirconocene catalysts and application to ethene polymerization [J].

Arai, T ;

Ban, HT ;

Uozumi, T ;

Soga, K .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 1997, 198 (02) :229-237

[2] Synthesis and characterization of polyolefin-silicate nanocomposites:: a catalyst intercalation and in situ polymerization approach [J].

Bergman, JS ;

Chen, H ;

Giannelis, EP ;

Thomas, MG ;

Coates, GW .

CHEMICAL COMMUNICATIONS, 1999, (21) :2179-2180

[3]

BONNI F, 1995, J POLYM SCI A, V33, P2393

[4]

CHIEN JCW, 1991, J POLYM SCI A, V29, P2603

[5] POLYMERIZATION OF PROPYLENE USING SUPPORTED, CHIRAL, ANSA-METALLOCENE CATALYSTS - PRODUCTION OF POLYPROPYLENE WITH NARROW MOLECULAR-WEIGHT DISTRIBUTIONS [J].

COLLINS, S ;

KELLY, WM ;

HOLDEN, DA .

MACROMOLECULES, 1992, 25 (06) :1780-1785

[6] Half-sandwich titanium complexes stabilized by a novel silsesquioxane ligand: Soluble model systems for silica-grafted olefin polymerization catalysts [J].

Duchateau, R ;

Abbenhuis, HCL ;

van Santen, RA ;

Thiele, SKH ;

van Tol, MFH .

ORGANOMETALLICS, 1998, 17 (24) :5222-5224

[7]

FLORY PJ, 1986, PRINCIPLES POLYM CHE, P317

[8] MONTMORILLONITE CRACKING CATALYST - X-RAY DIFFRACTION [J].

GRENALL, A .

INDUSTRIAL AND ENGINEERING CHEMISTRY, 1948, 40 (11) :2148-2151

[9] CONTROL OF MOLECULAR-WEIGHT AND MOLECULAR-WEIGHT DISTRIBUTION IN ETHYLENE POLYMERIZATION WITH METALLOCENE CATALYSTS [J].

HAN, TK ;

CHOI, HK ;

JEUNG, DW ;

KO, YS ;

WOO, SI .

MACROMOLECULAR CHEMISTRY AND PHYSICS, 1995, 196 (08) :2637-2647

[10]

HEILAND K, 1992, MAKROMOL CHEM, V193, P601

← 1 2 3 4 5 →