With the collaboration of Iran Polymer Society
Catalysis
The influence of magnesium dichloride as support on molecular weights of the polyethylenes produced by Ziegler-Natta catalyst

Tatiana B. Mikenas; A. V. Sholma; Vladimir A. Zakharov; Mikhail Matsko

Volume 11, Issue 4 , December 2024, , Pages 235-242

https://doi.org/10.22063/poj.2024.35573.1333

Abstract
  The paper presents data on the effect exerted by magnesium dichloride in Ziegler-Natta catalysts on the activity and molecular weight of polyethylene (PE) produced by ethylene polymerization in the absence or presence of hydrogen. It was found that ethylene polymerization in the absence of hydrogen over ...  Read More

Olefin polymerization and copolymerization
Ultra-high molecular weight polyethylene synthesis using externally modified Si-Mg-Ti based Z-N catalyst system

Hiren Bhajiwala; Virendrakumar Gupta

Volume 11, Issue 1 , February 2024, , Pages 61-70

https://doi.org/10.22063/poj.2023.3483.1279

Abstract
  Ultra-high molecular weight polyethylene (UHMWPE) was synthesized using Bi-supported SiO2/MgCl2/TiCl4 (Si-Mg-Ti) Ziegler-Natta catalyst in conjugation with triethyl aluminum (TEA). The impact of temperature and the presence of a chain-terminating agent were examined in the context of ethylene polymerization. ...  Read More

Catalysis
Substituent effect of Cp2TiCl2 catalyst for ethylene polymerization: A DFT study

Kefeng Xie; Wei Hao; Shengyuan Xu; Jie Wang; Xiong Wang; Zhengang Han

Volume 10, Issue 1 , January 2023, , Pages 35-43

https://doi.org/10.22063/poj.2022.3234.1235

Abstract
  The substituents on cyclopentadienyl (Cp) can regulate the electronic effect and hindrance of the active center in the metallocene catalyst. This modification can greatly change the catalytic activity of the catalyst and affect some features of the polymer. In order to study the effect of alkyl substituents ...  Read More

Catalysis
The influence of the oxygen donor capacity of polystearylmethacrylate over polyethylene bulk density when using modified methylaluminoxane as co-catalyst

Odilia Pérez-Camacho; Eduardo Cardozo-Villalba

Volume 9, Issue 2 , July 2022, , Pages 93-101

https://doi.org/10.22063/poj.2022.3095.1210

Abstract
  In this work, the interaction between a polystearylmethacrylate (Mn = 8,900 g mol-1, Xn = 26, Ð = 1.1) and modified methylaluminoxane 12 (MMAO-12) co-catalyst is studied using different spectroscopic methods. The effect of this oxygen-donor additive was measured by the changes in the bulk ...  Read More

Catalysis
Regulation of molecular weight, molecular weight distribution and branching distribution in polyethylene, produced by supported catalysts bearing bis(imino)pyridyl Fe(II) and N,N-α-diimine Ni(II) complexes

Nina V. Semikolenova; Valentina N. Panchenko; Mikhail A. Matsko; Vladimir A. Zakharov

Volume 9, Issue 2 , July 2022, , Pages 103-116

https://doi.org/10.22063/poj.2022.3072.1208

Abstract
  For preparation of highly active supported catalyst with bis(imino)pyridyl Fe(II) complexes (Fe1, Fe2) and N,N-α-diimine complex of Ni (Ni3), silica modified with alumina (SiO2 (Al)) was used as a support. Data on the possibility to regulate molecular weight (MW) and molecular weight distribution ...  Read More

Determination of kinetic parameters for ethylene polymerization (with and without hydrogen) by Ziegler-Natta catalyst

Seyed Mehdi Ghafelebashi Zaranda; Ali Safinejad

Volume 7, Issue 2 , July 2020, , Pages 121-130

https://doi.org/10.22063/poj.2020.2703.1157

Abstract
  In this study, slurry polymerization kinetics of ethylene with TiCl4/Mg(OEt)2/AlR3 Ziegler-Natta catalysts in various conditions using the model of sum square error (SSE) (method I) and model of least square error (LSE) (Method II) was investigated. For this purpose the molecular weight distributions ...  Read More

Catalysis
Introduction of titanium species into fluorine-modified SiO2- supported Cr-V bimetallic catalyst for ethylene polymerization and ethylene/1-hexene copolymerization

Qiaoqiao Sun; Ruihua Cheng; Zhen Liu; Xuelian He; Ning Zhao; Boping Liu

Volume 4, Issue 2 , June 2017, , Pages 221-234

https://doi.org/10.22063/poj.2017.1464

Abstract
  Chromium-vanadium (Cr-V) bimetallic catalysts are prepared by the introduction of vanadium into the Phillips catalyst which is one of the most significant industrial ethylene polymerization catalysts for tuning the Phillips catalyst performances and improving polyethylene properties. In the present work, ...  Read More

Catalysis
Imido-modified SiO2-supported Ti/Mg Ziegler-Natta catalysts for ethylene polymerization and ethylene/1-hexene copolymerization

Ting Fu; Ruihua Cheng; Xuelian He; Zhen Liu; Zhou Tian; Boping Liu

Volume 3, Issue 2 , June 2016, , Pages 103-117

https://doi.org/10.22063/poj.2016.1331

Abstract
  A novel imido-modified SiO2-supported Ti/Mg Ziegler-Natta catalyst for ethylene and ethylene/1-hexene polymerization is investigated. The catalyst is prepared by modification of (SiO2/MgO/MgCl2)TiClx Ziegler-Natta catalysts via supporting vanadium species followed by reaction with p-tolyl isocyanate ...  Read More

Catalysis
Phillips catalysts synthesized over various silica supports: Characterization and their catalytic evaluation in ethylene polymerization

Ebrahim Ahmadi; Zahra Mohamadnia; Sajjad Rahimi; Mohammad Hasan Armanmehr; Mohammad Hossein Heydari; Mahmood Razmjoo

Volume 3, Issue 1 , January 2016, , Pages 23-36

https://doi.org/10.22063/poj.2016.1268

Abstract
  Ethylene polymerization was carried out using Phillips chromium catalyst based on silica supports such as silica aerogel, SiO2 (Grace 643), and titanium modified SiO2 (G 643), and the results were compared with other catalysts based on SiO2 (Aldrich), SBA-15(Hex), SBA-15(Sp) and MCM-41. A combination ...  Read More

Catalysis
Synthesis of high molecular weight polyethylene using FI catalyst

G. Hossein Zohuri; Saman Damavandi; Saeid Ahmadjo; Reza sandaroos; Mohammad A. Shamekhi

Volume 1, Issue 1 , January 2014, , Pages 25-32

https://doi.org/10.22063/poj.2014.925

Abstract
  A FI Zr-based catalyst of bis[N-(3,5-dicumylsalicylidene)-2′,6′­diisopropylanilinato]zirconium(IV) dichloride was prepared and used for polymerization of ethylene. The effects of reaction conditions on the polymerization were examined in detail. The increase in ethylene pressure and rise ...  Read More