With the collaboration of Iran Polymer Society
Catalysis
Effects of Ti/Mg molar ratio on bi-supported SiO2/MgCl2 (ethoxide type)/TiCl4 catalysts in ethylene homopolymerization and ethylene/1-hexene copolymerization

Liang Zhu; Xuelian He; Ruihua Cheng; Zhen Liu; Ning Zhao; Boping Liu

Volume 5, Issue 1 , January 2018, , Pages 1-13

https://doi.org/10.22063/poj.2017.1470

Abstract
  SiO2/MgCl2 (ethoxide type)/TiCl4 Ziegler-Natta catalysts for use in ethylene polymerization and ethylene/1-hexene copolymerization have been prepared using silica with a supported layer of magnesium ethoxide (Mg(OEt)2) as a catalyst precursor, followed by treating with TiCl4 at different Ti/Mg ...  Read More

Catalysis
How can pH value during catalyst preparation affect the performance of vanadium-modified (SiO2/MgO/ MgCl2)•TiClx Ziegler-Natta polyethylene catalysts

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

Volume 5, Issue 1 , January 2018, , Pages 31-45

https://doi.org/10.22063/poj.2017.1492

Abstract
  Vanadium-modified (SiO2/MgO/MgCl2)•TiClx Ziegler-Natta catalysts were prepared through co-impregnation of water-soluble magnesium and vanadium salts under different pH values. Several key factors such as pH value of co-impregnation solution during catalyst preparation, catalyst performances including ...  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

Characterization
Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts

Ning Zhao; Ruihua Cheng; Qi Dong; Xuelian He; Zhen Liu; Shiliang Zhang; Minoru Terano; Boping Liu

Volume 1, Issue 2 , December 2014, , Pages 93-105

https://doi.org/10.22063/poj.2014.1045

Abstract
  SiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized ...  Read More