Effect of Hydrogen and External Donor on Propylene Polymerization Kinetics with a 4th -Generation Ziegler-Natta Catalyst

2012 ◽  
Vol 6 (6-7) ◽  
pp. 265-274 ◽  
Author(s):  
Ahmad Alshaiban ◽  
João B. P. Soares
Keyword(s):  
Polymerization Kinetics ◽  
Propylene Polymerization ◽  
External Donor ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Structure-Performance Relationship for Dialkyldimethoxysilane as an External Donor in Stopped-Flow Propylene Polymerization Using a Ziegler-Natta Catalyst

2014 ◽  
Vol 215 (18) ◽  
pp. 1721-1727 ◽  
Author(s):  
Supawadee Poonpong ◽  
Sumant Dwivedi ◽  
Toshiaki Taniike ◽  
Minoru Terano
Keyword(s):  
Propylene Polymerization ◽  
Stopped Flow ◽  
External Donor ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

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.

Control of Ziegler–Natta catalyst activity by the structural design of alkoxysilane-based external donors

2020 ◽  
Vol 44 (17) ◽  
pp. 6845-6852 ◽  
Author(s):  
Vikas Khatri ◽  
Usharani Sahoo ◽  
Sukhdeep Kaur ◽  
Rashmi Rani ◽  
Gurmeet Singh ◽  
...  
Keyword(s):  
Structural Design ◽  
Catalyst Activity ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Herein, the evaluation of four commercial alkoxysilanes and two laboratory synthesized novel diethoxysilacycloalkanes as external donors towards propylene polymerization has been done.

POISONING OF ACTIVE SITES ON ZIEGLER-NATTA CATALYST FOR PROPYLENE POLYMERIZATION

2008 ◽  
Vol 26 (05) ◽  
pp. 547 ◽  
Author(s):  
Kitti Tangjituabun ◽  
Sang Yull Kim ◽  
Yuichi Hiraoka ◽  
Toshiaki Taniike ◽  
Minoru Terano ◽  
...  
Keyword(s):  
Active Sites ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Kinetic modeling of slurry propylene polymerization using a heterogeneous multi-site type Ziegler–Natta catalyst

2011 ◽  
Vol 105 (2) ◽  
pp. 345-359 ◽  
Author(s):  
Hanieh Nassiri ◽  
Hassan Arabi ◽  
Shokoufeh Hakim
Keyword(s):  
Kinetic Modeling ◽  
Propylene Polymerization ◽  
Site Type ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Study of propylene polymerization catalyzed by a spherical MgCl2-supported Ziegler-Natta catalyst system: The effects of external donors

2004 ◽  
Vol 95 (3) ◽  
pp. 738-742 ◽  
Author(s):  
Zhenli Ma ◽  
Li Wang ◽  
Wenqin Wang ◽  
Lianfang Feng ◽  
Xueping Gu
Keyword(s):  
Catalyst System ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst
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