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Citation
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HERO ID
2855036
Reference Type
Journal Article
Title
Study of a novel fourth-generation supported Ziegler-Natta catalyst for propylene polymerization: Relationship between catalyst structure and polymerization properties
Author(s)
Liu T; Li, WL; Xia, XZ Mao, BQ
Year
2015
Is Peer Reviewed?
No
Journal
China Petroleum Processing and Petrochemical Technology
ISSN:
1008-6234
Volume
17
Issue
1
Page Numbers
39-47
Language
English
Web of Science Id
WOS:000353307900006
Abstract
This article presents a detailed structural study of a new spherical MgCl2-supported TiCl4 Ziegler-Natta catalyst for isotactic propylene polymerization, and researches on the relationship between catalyst structure and polymer properties. The spherical support with the chemical composition of CH3CH2OMgOCH(CH2Cl)(2) has been synthesized from a new dispersion system and is used as the supporting material to prepare Ziegler-Natta catalyst. The XRD analysis indicates that the catalyst is fully activated with delta-MgCl2 in the active catalyst. The far-IR spectrometric results confirm again the presence of delta-MgCl2 in the active catalyst. Textural property of the active catalyst exhibits high surface area coupled with high porosity. The high activity in propylene polymerization is mainly ascribed to the full activation and the porous structure of the catalyst. Scanning electron microscopy/energy dispersive spectrometer mapping results indicate a uniform titanium distribution throughout the catalyst particles. Particle size analysis shows that the catalyst has a narrow particle size distribution. The perfect spherical shape, uniform titanium distribution and narrow particle size distribution of the catalyst confirm the advantage of polymer particles production with less fines. The solid state C-13 NMR and mid-IR spectroscopic analyses indicate that there exists strong complexation between diisobutyl phthalate and MgCl2, which leads to the high isotacticity of polypropylene.
Keywords
Ziegler-Natta catalyst; MgCl2; propylene polymerization; structure characterization; polymerization properties
Tags
IRIS
•
Diisobutyl Phthalate (DIBP) Final
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