Chain structure of polyethylene/polypropylene in-reactor alloy synthesized in gas phase with spherical Ziegler–Natta catalyst

2004 ◽  
Vol 53 (8) ◽  
pp. 1169-1175 ◽  
Author(s):  
Zhisheng Fu ◽  
Zhiqiang Fan ◽  
Yanzhong Zhang ◽  
Junting Xu
Keyword(s):  
Gas Phase ◽  
Chain Structure ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

scholarly journals Multiplicity of Active-Site in Heterogeneous Ziegler-Natta Catalyst and Its Correlation with Polymer Microstructure

1970 ◽  
Vol 46 (4) ◽  
pp. 487-494
Author(s):  
ATM Kamrul Hasan
Keyword(s):  
Molecular Weight ◽  
Computer Simulation ◽  
Active Site ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Chain Structure ◽  
Surface Complexes ◽  
Polymer Microstructure ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Multiplicity of active-site in heterogeneous Ziegler-Natta catalysts and its correlation with polymer microstructure was studied through the surface structure analysis of catalyst by computer simulation of X-ray Photoelectron Spectroscopy (XPS) data and microstructure investigation of polypropylene chains based on the deconvolution of the molecular weight distribution curves by multiple Flory most probable distributions using Gel Permeation Chromatography (GPC) method. The number and relative intensities of these peaks were found correlated to the distribution of multiple active sites. In this investigation, four individual categories of active sites were identified, each of which yields polypropylene with unique properties of molecular weight and chain structure different from other active sites. The reason of the multiplicity of active sites was determined by the presence of different locations of surface titanium species coordinated with other surface atoms or molecules. These different surface complexes of active species determine the multiple active site nature of catalyst which replicates the microtacticity, molecular weight and chain microstructure distribution of polymer. Keywords: Ziegler-Natta catalyst; Multiple active sites; Flory components; Computer simulation; Deconvolution; MWD. DOI: http://dx.doi.org/10.3329/bjsir.v46i4.9596 BJSIR 2011; 46(4): 487-494

A Comparison of the Influence of Temperature During Slurry and Gas Phase Propylene Polymerization on Ziegler-Natta Catalyst

2016 ◽  
Vol 370 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Aarón J. Cancelas ◽  
Goond Hongmanee ◽  
Fabiana N. Andrade ◽  
Minoru Terano ◽  
Toshiaki Taniike ◽  
...  
Keyword(s):  
Gas Phase ◽  
Propylene Polymerization ◽  
Influence Of Temperature ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Synthesis of Propylene/1-Butene Copolymers with Ziegler-Natta Catalyst in Gas-Phase Copolymerizations, 1

2005 ◽  
Vol 206 (23) ◽  
pp. 2333-2341 ◽  
Author(s):  
Fabricio M. Silva ◽  
Enrique L. Lima ◽  
José C. Pinto ◽  
Timothy F. McKenna
Keyword(s):  
Gas Phase ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

scholarly journals Evaluation of the Initial Stages of Gas-Phase Ethylene Polymerizations with a SiO2-Supported Ziegler-Natta Catalyst

2009 ◽  
Vol 3 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Fabricio Machado ◽  
Enrique Luis Lima ◽  
José Carlos Pinto ◽  
Timothy F. McKenna
Keyword(s):  
Gas Phase ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst
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