Effect of Hydrogen and External Donor on the Microstructure of Polypropylene Made with a 4th Generation Ziegler-Natta Catalyst

2012 ◽  
Vol 7 (3-4) ◽  
pp. 135-145 ◽  
Author(s):  
Ahmad Alshaiban ◽  
João B. P. Soares
Keyword(s):  
External Donor ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Fundamental aspects of heterogeneous Ziegler–Natta olefin polymerization catalysis: an experimental and computational overview

2020 ◽  
Vol 11 (38) ◽  
pp. 6107-6128
Author(s):  
Jugal Kumawat ◽  
Virendra Kumar Gupta
Keyword(s):  
Olefin Polymerization ◽  
External Donor ◽  
Polymerization Catalysis ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Using an internal/external donor containing MgCl2-supported Ziegler–Natta catalyst is one of the important processes for polyolefin production.

Influences of silane/ether composite external donors on propylene polymerization with MgCl2-supported Ziegler-Natta catalyst in the presence of hydrogen

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Song-tao Tu ◽  
Jun-qin Lou ◽  
Zhi-sheng Fu ◽  
Zhi-qiang Fan
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Activity ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Catalyst System ◽  
Propylene Polymerization ◽  
External Donor ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

AbstractIn this work, the effects of two silane type external donors, Ph2Si(OCH3)2 (DPDMS) and dicyclopentyldimethoxysilane (DCPDMS) on propylene slurry polymerization in the presence of hydrogen with a MgCl2/TiCl4/DIBP - Al(C2H5)3 catalyst system were investigated, and the tacticity distribution and molecular weight distribution (MWD) of polypropylene (PP) were further regulated by using silane/ether (ROCH3, R = n-Bu, i-C8H17) composite external donors. The tacticity distribution of PP, as revealed by successive self-nucleation and annealing (SSA) thermo analysis of the polymer, is markedly changed by the external donors. DCPDMS shows much stronger effects than DPDMS. Addition of the ether as an auxiliary external donor in MgCl2/TiCl4/DIBP-TEA/silane (DPDMS or DCPDMS) lead to further increase in catalytic activity and isotacticity of PP, and changes in tacticity distribution. By using the composite external donors, PP with both higher isotacticity index, lower molecular weight or narrower molecular weight distribution was prepared at high activity. Effects of the external donors on the active center distribution were discussed based on the results of deconvoluting the MWD curve with multiple Flory “most-probable” distributions, and possible mechanism of the external donor effects was proposed.

DNP-SENS Formulation Protocols To Study Surface Sites in Ziegler–Natta Catalyst MgCl2 Supports Modified with Internal Donors

2021 ◽  
Author(s):  
Alexander Yakimov ◽  
Jun Xu ◽  
Keith Searles ◽  
Wei-Chih Liao ◽  
Giuseppe Antinucci ◽  
...  
Keyword(s):  
Surface Sites ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Mechanical properties of isotactic 1-butene-ethylene copolymers from Ziegler-Natta catalyst

Polymer ◽  
2021 ◽  
Vol 216 ◽  
pp. 123408
Author(s):  
Odda Ruiz de Ballesteros ◽  
Finizia Auriemma ◽  
Rocco Di Girolamo ◽  
Anna Malafronte ◽  
Miriam Scoti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ethylene Copolymers ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Insight into structural distribution of heterogeneous Ziegler–Natta catalyst from non-empirical structure determination

2020 ◽  
Author(s):  
Gentoku Takasao ◽  
Toru Wada ◽  
Ashutosh Thakur ◽  
Patchanee Chammingkwan ◽  
Minoru Terano ◽  
...  
Keyword(s):  
Structure Determination ◽  
Structural Distribution ◽  
Natta Catalyst ◽  
Insight Into ◽  
Ziegler Natta Catalyst
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