Journal of Polymer Science, Part A: Polymer Chemistry, Volume (54), No (18), Year (2016-7) , Pages (3000-3011)

Title : ( Polymerization of ethylene using a series of binuclear and a mononuclear Ni (II)-based catalysts )

Authors: Mostafa Khoshsefat , Gholamhossein Zohuri , Navid Ramezanian , Saeid Ahmadjo , meisam haghpanah ,

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A novel series of homo-, bi-, and mononuclear Ni(II)-based catalysts (BNCn n = 1–4, MNC4) were used for ethylene polymerization. The optimum conditions for the catalyst BNC4 (the highest catalytic activity) was obtained at [Al]/[Ni]=2000/1, Tp = 42 °C, and tp = 20 min that was 1073 g PE/mmol Ni h. In theoretical study, steric and electronic effects of substituents and diimine backbone led to prominent influence on the catalyst behavior. The highest MV was resulted from polymerization using BNC4; however, the highest unsaturation content was obtained from BNC1. GPC analysis showed a broad MWD (PDI = 17.8). BNC1 and BNC2 in similar structures showed broad peaks in DSC thermogram, while BNC3 and BNC4 with more electronic effects showed a peak along with a wide shoulder. Monomer pressure increasing showed enhancing in activity of the BNC4, meanwhile a peak with shoulder to a single peak in DSC thermogram and uniformity in morphology of the resulted polymer were observed.

Keywords

, Branch; binuclear nickel complex; catalysts; α, diimine catalyst; FTIR; late transition metal catalysts; polyethylene (PE); structural
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@article{paperid:1057752,
author = {Mostafa Khoshsefat and Zohuri, Gholamhossein and Ramezanian, Navid and Saeid Ahmadjo and Haghpanah, Meisam},
title = {Polymerization of ethylene using a series of binuclear and a mononuclear Ni (II)-based catalysts},
journal = {Journal of Polymer Science, Part A: Polymer Chemistry},
year = {2016},
volume = {54},
number = {18},
month = {July},
issn = {0887-624x},
pages = {3000--3011},
numpages = {11},
keywords = {Branch; binuclear nickel complex; catalysts; α-diimine catalyst; FTIR; late transition metal catalysts; polyethylene (PE); structural study},
}

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%0 Journal Article
%T Polymerization of ethylene using a series of binuclear and a mononuclear Ni (II)-based catalysts
%A Mostafa Khoshsefat
%A Zohuri, Gholamhossein
%A Ramezanian, Navid
%A Saeid Ahmadjo
%A Haghpanah, Meisam
%J Journal of Polymer Science, Part A: Polymer Chemistry
%@ 0887-624x
%D 2016

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