With the collaboration of Iran Polymer Society
Reaction engineering
Modelling the catalyst fragmentation pattern in relation to molecular properties and particle overheating in olefin polymerization

Mohsen Najafi; Mahmoud Parvazinia; Mir Hamid Reza Ghoreishy

Volume 1, Issue 2 , December 2014, Pages 77-91

https://doi.org/10.22063/poj.2014.1044

Abstract
  A two-dimensional single particle finite element model was used to examine the effects of particle fragmental pattern on the average molecular weights, polymerization rate and particle overheating in heterogeneous Ziegler-Natta olefin polymerization. A two-site catalyst kinetic mechanism was employed ...  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

Catalysis
Dissymmetric dinuclear transition metal complexes as dual site catalysts for the polymerization of ethylene

Haif Alshammari; Helmut G. Alt

Volume 1, Issue 2 , December 2014, Pages 107-116

https://doi.org/10.22063/poj.2014.1048

Abstract
  A series of dissymmetric dinuclear complexes were synthesized, as dual site catalysts in ethylene polymerization, by coupling the allylated a-diimine complexes of the metals Ti, Zr, V, Ni and Pd with the ansa-zirconocene complex [C5H4-SiH(Me)-C5H4]ZrCl2 possessing a hydride silane moiety. The different ...  Read More

Polyolefin degradation
The role of 1-hexene comonomer content in thermal behavior of medium density polyethylene (MDPE) synthesized using Phillips catalyst

Abbas Kebritchi; Mehdi Nekoomanesh; Fereidoon Mohammadi; Hossein Ali Khonakdar

Volume 1, Issue 2 , December 2014, Pages 117-129

https://doi.org/10.22063/poj.2014.1099

Abstract
  In this work, the role of comonomer content of 1-hexene-medium density polyethylene (MDPE) copolymer, synthesized using Phillips catalyst, on thermal behavior parameters such as: crystallization, melting temperature and thermal degradation was investigated in detail. The copolymer was fractionated to ...  Read More

Catalysis
Amoco CD commercial polypropylene catalyst tailor-made for the Amoco-Chisso gas phase process

Gregory G. Arzoumanidis

Volume 1, Issue 2 , December 2014, Pages 131-137

https://doi.org/10.22063/poj.2014.1098

Abstract
  The commercial profile of the Amoco CD MgCl2 supported polypropylene catalyst is presented. The development, the unique method of preparation/production, with emphasis on particle morphology, and the parameters affecting particle size (PS), particle size distribution (PSD), and particle shape ...  Read More

Computational chemistry & molecular modeling
Testing DFT ability to predict the stereoselectivity of group 4 metallocenes in propylene polymerization

Naeimeh bahri-Laleh; Laura Falivene; Luigi Cavallo

Volume 1, Issue 2 , December 2014, Pages 139-146

https://doi.org/10.22063/poj.2014.1100

Abstract
  In this study we have tested the ability of a standard DFT computational protocol to reproduce the experimentally obtained stereoselectivity of 26 different C2-symmetric zirconocene catalysts active in propylene polymerization. The catalysts were chosen for their relevance in metallocene catalyzed ...  Read More