Inorganica Chimica Acta, ( ISI ), Volume (502), Year (2020-3) , Pages (119354-119360)

Title : ( Synthesis of vinyl-terminated HDPE and PE/xGnP composite using dinuclear Co-based catalyst )

Authors: Enayat Rahimipour , Gholamhossein Zohuri , Mahsa Kimiaghalam , Mostafa Khoshsefat ,

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Abstract

To continue our previous researches on dinuclear late transition metal catalysts, a dinuclear catalyst based on cobalt (C) was prepared and used for polymerization of ethylene in the presence of modified methylaluminoxane (MMAO) as cocatalyst. The behavior of catalyst C was compared with its mononuclear analogue (M). The initial results showed higher in both activity and stability of the catalyst C in comparison to catalyst M. Based on this, the studies were focused on the catalyst C. The maximum activity of C observed at [Al]/[Co] molar ratio of 2000:1, reaction temperature of 60 °C that was equal to 6.8 × 106 g PE/mol Co.h. The GPC-IR results showed that the synthesized polyethylene has low Mw (Mw = 7.0 × 103 g/mol) along with a narrow MWD (2.56). Moreover, the polyethylene was containing low SCB (7.8 CH /1000C) in confirmation of high crystallinity obtained by DSC (χc3 = 60%). Due to layered morphology of the catalyst C observed through SEM images, the shape of PE was layered consistent on replication phenomenon. Besides, this morphology observed in SEM and TEM images of PE/xGnP composites with higher intensity. The presence of xGnP also led to a slightly greater activity of the catalyst C along with higher vinyl content and lower starting degradation temperature of the obtained PE.

Keywords

, Keywords: Ethylene polymerization, Late transition metal catalysts, Multinuclear catalysts, Methylaluminoxane, Nano-composites
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@article{paperid:1078722,
author = {Rahimipour, Enayat and Zohuri, Gholamhossein and Kimiaghalam, Mahsa and مصطفی خوش صفت},
title = {Synthesis of vinyl-terminated HDPE and PE/xGnP composite using dinuclear Co-based catalyst},
journal = {Inorganica Chimica Acta},
year = {2020},
volume = {502},
month = {March},
issn = {0020-1693},
pages = {119354--119360},
numpages = {6},
keywords = {Keywords: Ethylene polymerization; Late transition metal catalysts; Multinuclear catalysts; Methylaluminoxane; Nano-composites},
}

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%0 Journal Article
%T Synthesis of vinyl-terminated HDPE and PE/xGnP composite using dinuclear Co-based catalyst
%A Rahimipour, Enayat
%A Zohuri, Gholamhossein
%A Kimiaghalam, Mahsa
%A مصطفی خوش صفت
%J Inorganica Chimica Acta
%@ 0020-1693
%D 2020

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