Study on ethylene polymerization catalyzed by Cp2ZrCl2/carbon nanotube system

Dong, Xiaochen; Wang, Li; Sun, Tianxu; Zhou, Jinghong; Yang, Qiang

doi:10.1016/j.molcata.2006.03.053

Cited by 15 publications

(9 citation statements)

References 14 publications

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“…Recently, a method was derived from the polymerizationfilling technique (PFT) initially employed in Ziegler-Natta polymerization processes and more recently adapted for the application of metallocene catalysts to a wide range of microfillers, such as kaolin, silica, wollastonite, graphite, and glass microspheres [9][10][11][12][13][14][15][16]. The PFT is usually applied for coating CNTs by polyethylene (PE) in a four-step process: (a) anchoring methylaluminoxane (MAO), a commonly-used cocatalyst in metallocene-based olefin polymerization, onto the CNT surface, (b) addition of the metallocene catalyst onto the surface-activated CNT, (c) polymerization of ethylene onto the CNT surface, (d) precipitation of PE onto the CNTs leading to their coating.…”

Section: Introductionmentioning

confidence: 99%

Easy one-pot method to control the morphology of polyethylene/carbon nanotube nanocomposites using metallocene catalysts

Bahuleyan

Atieh

et al. 2012

J Polym Res

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An easy one pot method is demonstrated for the controlled periodical surface coating of polyethylene over multiwalled carbon nanotubes (MWCNT) by insitu polymerization of ethylene using highly active metallocene catalysts (Cp 2 ZrCl 2 and Cp 2 TiCl 2 ) in combination with methylalumoxane. The crystallinity of the nanocomposite was increased and its morphology could be tuned from "sausage" like to "shish-kebab" in the presence of CNT depending on the experimental condition and choice of metal atom.

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Section: Introductionmentioning

confidence: 99%

Easy one-pot method to control the morphology of polyethylene/carbon nanotube nanocomposites using metallocene catalysts

Bahuleyan

Atieh

et al. 2012

J Polym Res

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“…CNTs are stabilized by weak van der Waals forces along with π-π interactions between the tubes which lead to the formation of aggregates. e factors influencing polymer nanocomposite properties include the type of nanofillers, microstructure of polymers, and nanocomposite preparation techniques like melt mixing, solution blending, and in situ polymerization [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…e polymerization filling technique (PFT) was commonly used for Ziegler-Natta and metallocene polymerization with a wide variety of microfillers such as graphite, kaolin, glass spheres, wollastonite, silica, and so on, which lead to an in situ polymerization technique in combination with various cocatalysts [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In PFT, polyethylene (PE) is coated on CNT fillers by a four-step process in which the first one includes anchoring of methylaluminoxane (MAO) cocatalyst to CNT, secondly, addition of catalyst to the activated CNT using MAO, then, ethylene polymerization using the CNT-based catalyst, and finally, precipitation of PE on CNTs as coating.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Polyethylene‐Carbon Nanotube Composites Synthesized by In Situ Polymerization Using Metallocene Catalysts

Al‐Harthi

Bahuleyan

2018

Advances in Materials Science and Engineering

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The influence of multiwalled carbon nanotubes (MWCNTs) on the properties of polyethylene prepared by in situ polymerization using metallocene catalyst (Cp2ZrCl2) in combination with methylaluminoxane has been studied. The MWCNT was incorporated in the polymer matrix adopting a stirring method. Incorporation of MWCNT causes a drop in molecular weight of the polymer along with an increase in number of branches and increase in crystallinity. It was also observed that addition of MWCNT during metallocene-catalyzed polymerization caused a drop in both the dynamic modulus and Young’s modulus of polyethylene. But the drop in tensile strength was minimal, and there was an increase in elongation at break along with consequent increase in energy at break.

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“…The capped ends of CNTs are opened partly after treatment with nitric acid. The catalyst can disperse into the pore of the CNTs, so the hydraulic pressure of ethylene in polymerization makes the CNTs break up into fragments and the resultant PE has fractional morphology [32,33].…”

Section: Ethylene Polymerizationmentioning

confidence: 99%

Nanocatalysts in Olefins and Dienes Polymerization Processes

Nasirov¹

2021

J Mater Sci Manufac Res

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Sustainable development, the design of green and economically feasible processes to produce synthetic polymers is one of the major needs and biggest challenges. Catalysis of polymerization processes is among the most important applications within the field of nanoscience. Intensive research is being conducted and considerable success has been achieved in the heterogenization of various homogeneous catalysts on nano supports for polymerization of olefins and dienes. The large surface area of various nanomaterials qualifies them quite naturally to act either as a heterogeneous promoter for catalytic reactions or as a support for the heterogenization of homogeneous catalysts. To the polymerization of olefins and dienes by using nanocatalysts are devoted significant numbers of published papers, but to elucidate the possible effect of both the type and properties of nano supports and their sizes and amounts on the activity and stereoselectivity of heterogenized catalysts and the properties of the obtained polymers are needed more detailed studies. This review attempted to collect some published research materials in the field of the nanocatalysis of olefins and dienes polymerization processes and our main aim is to assess the critical points and to indicate the future perspectives and possible strategies in this area of research. We are confident that this review will be a helpful companion and deliver key hints to those, in academia and in the industry, who decide to move their research interest in this direction

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Study on ethylene polymerization catalyzed by Cp2ZrCl2/carbon nanotube system

Cited by 15 publications

References 14 publications

Easy one-pot method to control the morphology of polyethylene/carbon nanotube nanocomposites using metallocene catalysts

Easy one-pot method to control the morphology of polyethylene/carbon nanotube nanocomposites using metallocene catalysts

Mechanical Properties of Polyethylene‐Carbon Nanotube Composites Synthesized by In Situ Polymerization Using Metallocene Catalysts

Nanocatalysts in Olefins and Dienes Polymerization Processes

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