Modification of a Ziegler-Natta catalyst with a metallocene catalyst and its olefin polymerization behavior

1999 ◽  
Vol 39 (7) ◽  
pp. 1257-1264 ◽  
Author(s):  
Tae Oan Ahn ◽  
Sung Chul Hong ◽  
Wan Soo Huh ◽  
Young-Chul Lee ◽  
Dong-Ho Lee
Keyword(s):  
Olefin Polymerization ◽  
Metallocene Catalyst ◽  
Polymerization Behavior ◽  
Natta Catalyst ◽  
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.

Photo-Oxidative Degradation of Metallocene Linear Low-Density Polyethylene

2009 ◽  
Vol 610-613 ◽  
pp. 243-247 ◽  
Author(s):  
Fu Chen Bai ◽  
Chun Xiao Zhang ◽  
Xi Yao Zhang ◽  
Jian Liu ◽  
Wei Tian
Keyword(s):  
Oxidative Degradation ◽  
Metallocene Catalyst ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Elongation At Break ◽  
Photo Oxidation ◽  
Chemical Structures ◽  
Natta Catalyst ◽  
Physical And Chemical ◽  
Ziegler Natta Catalyst

Films of linear-low density polyethylenes, made from metallocene catalyst and Ziegler-Natta catalyst , were exposed to accelerate photo-oxidation conditions. The investigations were focused on the changes of the physical and chemical structures and elongation at break occurring in the photo-oxidation process. The results showed that ethylene-hexene m-LLDPE was more favorer to photo-oxidize than ethylene-octene LLDPE. The other two ethylene-ocetene m-LLDPEs were comparable to LLDPE with the same comonomer. The oxidation rate of LDPE is slower than those of all the LLDPEs.

scholarly journals An Investigation on Polymerization of Ethylene by Ziegler-Natta Catalyst in the Presence of a Promoter: Polymerization Behavior and Polymer Microstructure

2018 ◽  
Vol 13 (3) ◽  
pp. 412 ◽  
Author(s):  
Yaghoob Gholami ◽  
Majid Abdouss ◽  
Sadegh Abedi ◽  
Farhad Azadi ◽  
Pezhman Baniani ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Average Molecular Weight ◽  
Polymerization Rate ◽  
Ethyl Chloride ◽  
Chain Length Distribution ◽  
Polymer Microstructure ◽  
Polymerization Behavior ◽  
Natta Catalyst ◽  
The Impact ◽  
Ziegler Natta Catalyst

The effect of a halocarbon (ethyl chloride) as a promoter on a Ziegler-Natta catalyst composed of‌ T‌iCl4 (catalyst), AlEt3 (activator) and Mg(OEt)2 (support) in the polymerization of ethylene have been investigated. In addition, the impact of this compound on the structural and thermal properties of the produced polyethylene has been studied. The catalyst activity and polymerization rate increased almost up to twice when a suitable molar ratio of ethyl chloride to triethylaluminum (TEA) was used. There was no change in the type of the profile of the polymerization rate during the polymerization time. A reduction in the polymer molecular weight was observed in the presence of the promoter and hydrogen. In addition, the MWD curve shifted toward lower values in the presence of ethyl chloride. Furthermore, a numerical method was used to obtain the most probable chain-length distribution, number   average molecular weight and weight fraction corresponding to each site type in the presence and absence of the promoter. Since, the catalyst had an irregular shape, the produced polymer also showed a similar morphology. In addition, the promoter used in the polymerization did not have any effect on the produced polymer morphology. The DSC results indicated that the presence of the promoter in the polymerization led to a decrease in the melting point of the produced polymer; whereas, there were no remarkable changes in the crystallization temperature of the polymers. Copyright © 2018 BCREC Group. All rights reservedReceived: 2nd October 2017; Revised: 5th April 2018; Accepted: 26th April 2018How to Cite: Gholami, Y., Abdouss, M., Abedi, S., Azadi, F., Baniani, P., Arsalanfar, M. (2018). An Investigation on Polymerization of Ethylene by Ziegler-Natta Catalyst in the Presence of a Promoter: Polymerization Behavior and Polymer Microstructure. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 412-419 (doi:10.9767/bcrec.13.3.1574.412-419)Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.1574.412-419  

.eta.5-C5Me5TiMe3B(C6F5)3: A carbocationic olefin polymerization initiator masquerading as a Ziegler-Natta catalyst

1994 ◽  
Vol 116 (14) ◽  
pp. 6435-6436 ◽  
Author(s):  
Ruhksana Quyoum ◽  
Qinyan Wang ◽  
Marie-Jose Tudoret ◽  
Michael C. Baird ◽  
Daniel J. Gillis
Keyword(s):  
Olefin Polymerization ◽  
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.

Preparation of novel MgCl2-adduct supported spherical Ziegler-Natta catalyst for α-olefin polymerization

2005 ◽  
Vol 99 (3) ◽  
pp. 945-948 ◽  
Author(s):  
Li Wang ◽  
Hao-Jie Yu ◽  
Zhen-Li Ma ◽  
Zhao-Yang Ye ◽  
Shan Jiang ◽  
...  
Keyword(s):  
Olefin Polymerization ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

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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