Kinetics of short-duration ethylene-propylene copolymerization with MgCl2 -supported Ziegler-Natta catalyst: Differentiation of active centers on the external and internal surfaces of the catalyst particles

2017 ◽  
Vol 135 (12) ◽  
pp. 46030 ◽  
Author(s):  
Akbar Khan ◽  
Yintian Guo ◽  
Zhen Zhang ◽  
Amjad Ali ◽  
Zhisheng Fu ◽  
...  
Keyword(s):  
Short Duration ◽  
Active Centers ◽  
Ethylene Propylene ◽  
Internal Surfaces ◽  
Natta Catalyst ◽  
Kinetics Of ◽  
Ziegler Natta Catalyst

Responses of a Supported Ziegler–Natta Catalyst to Comonomer Feed Ratios in Ethylene–Propylene Copolymerization: Differentiation of Active Centers with Different Catalytic Features

2021 ◽  
Vol 60 (12) ◽  
pp. 4575-4588
Author(s):  
Biao Zhang ◽  
Qingyun Qian ◽  
Pengjia Yang ◽  
Baiyu Jiang ◽  
Zhisheng Fu ◽  
...  
Keyword(s):  
Active Centers ◽  
Ethylene Propylene ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Study on the distribution of active centers in novel low Ti-loading MgCl2-supported Ziegler-Natta catalyst

2004 ◽  
Vol 5 (8) ◽  
pp. 912-917 ◽  
Author(s):  
Jian-feng Wang ◽  
Li Wang ◽  
Zhen-rong Zhao ◽  
Wen-qing Wang ◽  
Tao Chen
Keyword(s):  
Active Centers ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Ethylene-propylene copolymers by a supported Ziegler-Natta catalyst based on TiCl4/MgCl2

1997 ◽  
Vol 39 (2) ◽  
pp. 133-140 ◽  
Author(s):  
Fernanda M. B. Coutinho ◽  
José Luiz Luna Xavier
Keyword(s):  
Ethylene Propylene ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Synthesis of ethylene-propylene-diene terpolymers with supported Ziegler-Natta catalyst

1993 ◽  
Vol 31 (3) ◽  
pp. 271-278 ◽  
Author(s):  
M. F. V. Marques ◽  
F. M. B. Coutinho
Keyword(s):  
Ethylene Propylene ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Kinetics of the propylene polymerization with prepolymerization at high temperature using Ziegler-Natta catalyst

2014 ◽  
Vol 132 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Ning Tan ◽  
Luqiang Yu ◽  
Zhong Tan ◽  
Bingquan Mao
Keyword(s):  
High Temperature ◽  
Propylene Polymerization ◽  
Natta Catalyst ◽  
Kinetics Of ◽  
Ziegler Natta Catalyst

Comparative Polymerization Activity of EPM and EPDM Using VCI4 Homogenous Ziegler-Natta Catalyst and Characterization of EPDM Obtained

2005 ◽  
Vol 78 (4) ◽  
pp. 682-693 ◽  
Author(s):  
G. H. Zohuri ◽  
M. Vakili ◽  
R. Jamjah ◽  
S. Ahmadjo ◽  
M. Nekomanesh
Keyword(s):  
Catalyst System ◽  
Relative Pressure ◽  
Polymerization Time ◽  
Polymer Yield ◽  
Ethylene Propylene ◽  
Good Thermal Stability ◽  
Time Profiles ◽  
Polymerization Behavior ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Abstract Copolymerization of ethylene/propylene (EPM) and terpolymerization of ethylene/propylene/5-ethylidene-2-nor-bornene (ENB) were carried out using VCl4 based Ziegler-Natta catalyst. Triisobutylaluminum (TIBA) was used as a cocatalyst while CHCl3 and CCl4 were used as promoters. Effects of [Al]/[V] ratio, temperature, promoters and ENB concentration, relative pressure of P/E, H2 concentration and polymerization time on polymerization behavior were studied. The highest productivity of the catalyst was obtained at [Al]/[V] ratio of 8–10. Increasing the [Al]/[V] ratio increased Et% and Tg and decreased ENB% of the EPDM (ethylene / propylene / diene) obtained. Activity of the catalyst system was higher for EPM than EPDM. ENB concentration affected polymer yield. Increasing ENB from 5 ml/Lit solvent to 10 ml /Lit solvent increased productivity of the catalyst; however, higher concentration decreased the EPDM polymer yield. Addition of ENB increased Et% of the EPDM. Polymerization of EPDM was carried out at temperatures of 25 °C to 75 °C. The highest productivity was obtained at ∼ 50 °C. At reaction temperature of ∼ 55 °C, Et% and ENB% were 65.5% and 9%, respectively. Rp/time profiles were decay types for both EPM and EPDM production. Et% of EPDM increased with polymerization time, while an inverse result was obtained for ENB%. Addition of CHCl3 to 3 ml /lit solvent increased productivity of the catalyst. However, addition of CCl4 did not have such effect on the yield of the polymer obtained. Effect of relative pressure of P/E=1.25:1 to 0.89:1 on EPDM polymerization was studied. Addition of ethylene relative pressure increased Et% and increased Tg of the EPDM obtained. The lowest Tg of the EPDM obtained was −39 °C. A compound made with the EPDM showed good thermal stability.

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