Title : ( Dinuclear catalysts with two adjacent Ni centers for ethylene polymerization )
Authors: مصطفی خوشصفت , سمیرا لکوراج منصوری , عباس دچال , سعید احمدجو , سید محمد مهدی مرتضوی , Gholamhossein Zohuri , J. B.P. Soares ,
Full TextAbstract
A series of mono- (M1 and M2) and dinuclear (C1-C6) Ni α-diimine catalysts activated by modified methylaluminoxane (MMAO) were used in polymerization of ethylene. The behavior of catalysts and polymer properties regarding ligand architecture from ortho-substituent and backbone to rigidity/flexibility of the linker between the active centers were investigated. Catalyst C2 bearing the optimum bulkiness and dinuclearity showed the highest activity (1.6×106 gr. PE/mol Ni.h), lower short chain branching (32.5/1000 C) in comparison to dinuclear and mononuclear analogues. Although, the mononuclear catalysts M1 and M2 polymerized ethylene to a branched amorphous polymer, the dinuclear catalysts made different branched semicrystalline PE. Kinetic profiles of polymerization showed the relation between the structure and monomer uptake where the monomer uptakes were too fast for mononuclears but higher stability of C2 led to greater consumption at prolonged polymerization.
Keywords
, polyethylene, synergistic effect, dinuclear catalyst, late transition metal, structure-property relation
@inproceedings{paperid:1071508,
author = {مصطفی خوشصفت and سمیرا لکوراج منصوری and عباس دچال and سعید احمدجو and سید محمد مهدی مرتضوی and Zohuri, Gholamhossein and J. B.P. Soares},
title = {Dinuclear catalysts with two adjacent Ni centers for ethylene polymerization},
booktitle = {ISPST},
year = {2018},
location = {Tehran, IRAN},
keywords = {polyethylene; synergistic effect; dinuclear catalyst; late transition metal; structure-property relation},
}
%0 Conference Proceedings
%T Dinuclear catalysts with two adjacent Ni centers for ethylene polymerization
%A مصطفی خوشصفت
%A سمیرا لکوراج منصوری
%A عباس دچال
%A سعید احمدجو
%A سید محمد مهدی مرتضوی
%A Zohuri, Gholamhossein
%A J. B.P. Soares
%J ISPST
%D 2018
