A New High-Performance Ziegler–Natta Catalyst with Vanadium Active Component Supported on Highly-Dispersed MgCl2 for Producing Polyethylene with Broad/Bimodal Molecular Weight Distribution | Sciact - CRIS-system of Boreskov Institute of Catalysis

A New High-Performance Ziegler–Natta Catalyst with Vanadium Active Component Supported on Highly-Dispersed MgCl2 for Producing Polyethylene with Broad/Bimodal Molecular Weight Distribution Full article

Journal

Polymer Chemistry
ISSN: 1759-9954 , E-ISSN: 1759-9962

Output data

Year: 2012, Volume: 3, Pages: 2377-2382 Pages count : 5 DOI: 10.1039/C2PY20163A

Tags

Mechanical properties; Molecular weight distribution; Nuclear magnetic resonance spectroscopy; Polyethylenes; Polymerization; Titanium; Vanadium

Authors

Wang Dongsheng ¹ , Zhao Zenghui ² , Mikenas T.B. ³ , Lang Xiaomei ² , Echevskaya L.G. ³ , Zhao Chengcai ² , Matsko M.A. ³ , Wu Wei ¹

Affiliations

1	Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Chemical Engineering Process&Technology for High- efficiency Conversion, College of Heilongjiang Province, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
2	China National Petroleum Corporation, Daqing Chemical Research Institution, Daqing 163714, Heilongjiang, China
3	Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia

Funding (1)

Ministry of Science and Technology of the People's Republic of China

2008DFR40400

In this paper, we synthesized a highly-dispersed MgCl2 support using the Grignard reagent method, and loaded it with TiCl4 and VCl4 to prepare polyethylene catalysts with titanium and vanadium active centers. The two catalysts demonstrated narrow particle distribution. The polymerization data demonstrated that the two catalysts both had good activity. And GPC and 13C NMR data indicated that polymer produced with vanadium active centers has some good characteristics, a broader molecular weight distribution and higher degree of methyl branching compared with polymer produced by catalysts with titanium active centers. Also, we found that the molecular weight distribution can be controlled by changing the hydrogen pressure in polymerization; because of the dual active sites have different responses to hydrogen pressure. Also, through 13C NMR data, we found that most of the methyl branching occurred in the high molecular weight part. The existence of methyl branching in the high molecular weight part and broader molecular weight distribution of polyethylene can solve the contradiction of mechanical properties and processing properties.

Wang D. , Zhao Z. , Mikenas T.B. , Lang X. , Echevskaya L.G. , Zhao C. , Matsko M.A. , Wu W.
A New High-Performance Ziegler–Natta Catalyst with Vanadium Active Component Supported on Highly-Dispersed MgCl2 for Producing Polyethylene with Broad/Bimodal Molecular Weight Distribution
Polymer Chemistry. 2012. V.3. P.2377-2382. DOI: 10.1039/C2PY20163A WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Mar 20, 2012
Accepted:	Jun 9, 2012
Published online:	Jun 27, 2012

Web of science:	WOS:000306967600008
Scopus:	2-s2.0-84875213855
Elibrary:	20569010
Chemical Abstracts:	2012:1124314
Chemical Abstracts (print):	157:520757
OpenAlex:	W2017541100

DB	Citing
Web of science	18
Scopus	19
Elibrary	21
OpenAlex	22