Supported coordination polymerization: a unique way to potent polyolefin carbon nanotube nanocomposites

Bonduel, Daniel; Mainil, Michaël; Alexandre, Michaël; Monteverde, Fabien; Dubois, Philippe

doi:10.1039/b414164d

Cited by 112 publications

(104 citation statements)

References 18 publications

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“…A superfície dos nanotubos é previamente tratada com um sistema catalítico adequado e a polimerização do monômero inicia diretamente na superfície dos NTC, ocorrendo assim, a formação do polímero ao redor dos nanotubos. Este processo original, chamado de técnica de polimerização de enchimento (TPE) foi inicialmente investigado na polimerização in situ utilizando catalisadores Ziegler-Natta [17] . A partir disso, o método foi estendido para os catalisadores metalocênicos e consiste, primeiramente, em ancorar metilaluminoxano (MAO), o cocatalisador, na superfície dos NTCs [1,[17][18][19][20][21][22] .…”

Section: -Comparação Entre Nanocompósitos De Polietileno/nanotubos Deunclassified

“…Este processo original, chamado de técnica de polimerização de enchimento (TPE) foi inicialmente investigado na polimerização in situ utilizando catalisadores Ziegler-Natta [17] . A partir disso, o método foi estendido para os catalisadores metalocênicos e consiste, primeiramente, em ancorar metilaluminoxano (MAO), o cocatalisador, na superfície dos NTCs [1,[17][18][19][20][21][22] . Outros autores tem ligado diretamente o catalisador metalocênico diretamente ao suporte de NTCPMs, previamente oxidado, de maneira a ligar o catalisador aos grupos funcionais-COOH ou -OH criados nos NTCs durante a oxidação [23,24] .…”

Section: -Comparação Entre Nanocompósitos De Polietileno/nanotubos Deunclassified

“…Outros autores tem ligado diretamente o catalisador metalocênico diretamente ao suporte de NTCPMs, previamente oxidado, de maneira a ligar o catalisador aos grupos funcionais-COOH ou -OH criados nos NTCs durante a oxidação [23,24] . A adição de monômero olefínico leva à síntese de cadeias poliméricas exclusivamente localizadas nos arredores da superfície do NTC que, com o aumento de massas moleculares, precipita-se sobre os nanotubos, cobrindo-os e levando a uma eficiente desaglomeração [1,17,22] . Nos últimos anos nosso grupo de pesquisa vem trabalhando na obtenção de nanolâminas de grafeno (NG) (empilhamento de poucos grafenos) através de esfoliação química e térmica da grafite e na preparação de nanocompósitos de polietileno (PE) [25,26] e de polipropileno (PP) [27][28][29] utilizando a técnica de polimerização in situ.…”

Section: -Comparação Entre Nanocompósitos De Polietileno/nanotubos Deunclassified

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Comparação entre Nanocompósitos de Polietileno/Nanotubos de Carbono e Polietileno/Nanolâminas de Grafeno Obtidos por Polimerização In Situ

Fim¹,

Radaelli²,

Azambuja³

et al. 2014

Polímeros

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Resumo: Nanocompósitos de polietileno/nanotubos de carbono foram sintetizados através da polimerização in situ para serem comparados com nanocompósitos de polietileno/nanolâminas de grafeno, obtidos nas mesmas condições. Os nanocompósitos de polietileno/NTC foram obtidos com boas atividades catalíticas e foram caracterizados por DSC e MET. Os nanocompósitos com NG apresentaram melhor estabilidade térmica que os de NTC, porem não houve diferenças significativas nas propriedades dinâmico-mecânicas. No estudo da condutividade elétrica os nanocompósitos PE/NTC atingiram condutividades de materiais semicondutores com menor teor de nanocarga que os de PE/NG. Palavras-chave: Nanolâminas de grafeno, nanotubos de carbono, polietileno, nanocompósitos. Comparison between Polyethylene/Carbon Nanotubes and Polyethylene/Graphene Nanosheets Nanocomposites Obtained by In Situ Polymerization Abstract: Polyethylene/carbon nanotubes, PE/NTC, nanocomposites were synthesized by in situ polymerization for comparison with polyethylene/graphene nanosheets, PE/NG, nanocomposites obtained in the same conditions. The nanocomposites of polyethylene/NTC were obtained with good catalytic activities and were characterized by DSC and TEM. The nanocomposites with NG showed better thermal stability than with NTC, however, no significant differences in dynamic mechanical properties were found. In the electrical conductivity study, PE/NTC nanocomposites reached conductivities of semiconductor materials at lower content of filler than PE/NG nanocomposites.

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Section: -Comparação Entre Nanocompósitos De Polietileno/nanotubos Deunclassified

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Comparação entre Nanocompósitos de Polietileno/Nanotubos de Carbono e Polietileno/Nanolâminas de Grafeno Obtidos por Polimerização In Situ

Fim¹,

Radaelli²,

Azambuja³

et al. 2014

Polímeros

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“…[11] The surface coating of long (multi-wall -MWNTs-or single-wall -SWNTs-) carbon nanotubes has been achieved by in situ polymerization of ethylene as catalyzed directly from the nanotube previously surface-treated by a highly active metallocene-based complex (Fig. 5).…”

Section: Polymer Carbon Nanotube Nanoconmpositesmentioning

confidence: 99%

Performant Clay/Carbon Nanotube Polymer Nanocomposites

Dubois

Alexandre

2006

Adv Eng Mater

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This contribution aims at reviewing on very recent developments in syntheses, properties and (future) applications of polymer‐based nanocomposites filled with either organoclays and/or carbon nanotubes. Undoubtedly, the key‐challenge remains to reach a high level of nanoparticle dissociation (i.e., either to delaminate the silicate nanoplatelets or to break down the bundles of aggregated carbon nanotubes) and their fine dispersion upon melt blending within the selected polymer matrix. In that context, the in situ polymerization/grafting process as catalyzed directly from the nanofiller (organoclay or carbon nanotube) surface proved highly efficient allowing for the complete destructuration of the native filler aggregates. Dissociated nanoparticles were accordingly recovered, their surface was homogeneously coated/grafted by the in situ grown polymer chains as generated by this so‐called “Polymerization‐filling technique” (PFT). Interestingly enough, such surface‐coated organoclays and/or carbon nanotubes were further added as “masterbatch” in commercial polymeric matrices by twin‐screw extrusion. As a result of the pre‐destructuration of the nanofillers by PFT, it comes out that the resulting polymer nanocomposites displayed much higher thermo‐mechanical properties even with a nanofiller loading as tiny as 1wt%.

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“…The polymerization filling technique (PFT) has proved very efficient in this regard. This method, initially investigated in Ziegler-Natta polymerization [6][7][8] and more recently developed for metallocene catalysis applied to a broad range of microfillers (e.g., kaolin, silica, carbon nanotubes, and graphite), [9][10][11] consists of anchoring a polymerization catalyst directly onto the filler surface, followed by its activation with a cocatalyst. The polymer chains grow directly from the catalytic species upon in situ addition of the monomer, and for this reason the polymer is formed in very close contact with the filler surface.…”

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confidence: 99%

Polyethylene Microtubes from Silica Fiber‐based Polyethylene Composites Synthesized by an In Situ Catalytic Method

et al. 2006

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Most composite materials that consist of a thermoplastic matrix and a particulate filler are prepared by mechanical mixing of the components above the melting temperature of the polymer. Both organic (e.g., poly-p-(phenylene terephthalamide): PpPTA, polyethylene: PE) and inorganic (carbon, glass) fibers are extensively used as fillers for polymer-based composite materials; in particular, silica fibers combine the advantages of high tensile and compressive strengths with low cost, when compared to other competing fibers. [1,2] PE is one of the polymers most often used as a matrix because of its chemical resistance to solvents, low friction coefficient, hydrophobicity, and biocompatibility.[3]However, the mechanical mixing of components does not allow a fine and homogeneous dispersion of the filler, [4,5] and the resulting material is usually characterized by poor mechanical properties. In order to improve the properties of the resulting composite, a direct connection of the polymer with the surface of the filler is highly desirable. The polymerization filling technique (PFT) has proved very efficient in this regard. This method, initially investigated in Ziegler-Natta polymerization [6][7][8] and more recently developed for metallocene catalysis applied to a broad range of microfillers (e.g., kaolin, silica, carbon nanotubes, and graphite), [9][10][11] consists of anchoring a polymerization catalyst directly onto the filler surface, followed by its activation with a cocatalyst. The polymer chains grow directly from the catalytic species upon in situ addition of the monomer, and for this reason the polymer is formed in very close contact with the filler surface. Such a technique leads to a much more uniform filler distribution and a considerably enhanced interfacial adhesion, even at high filler content, compared to conventional mechanical techniques. In this work we present an original method to realize silicamicrofiber-based PE composites, which relies upon the in situ polymerization of ethylene from the gas phase, catalyzed by active Cr species anchored onto the surface of the silica microfibers. As a result, silica microfibers are homogeneously coated and interconnected by the PE chains grown in situ, forming a promising composite material without the need for post-synthesis processing. With respect to the PFT technique mentioned above, this "microprocessing" method is much cleaner because it does not require the use of cocatalysts and solvents. In particular, we demonstrate that by properly tuning the reaction conditions, it is possible to move from wellisolated to exclusively interconnected homogeneously PEcoated silica fibers, which finally constitute a real microcomposite material. The possibility of realizing a well-defined PE coating on silica microfibers can be used in an inverse way, i.e., by considering the silica microfibers as templates for the realization of PE microtubes. Here, we demonstrate that removal of the internal silica core from the composite material indeed results in the formation of PE ...

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Supported coordination polymerization: a unique way to potent polyolefin carbon nanotube nanocomposites

Cited by 112 publications

References 18 publications

Comparação entre Nanocompósitos de Polietileno/Nanotubos de Carbono e Polietileno/Nanolâminas de Grafeno Obtidos por Polimerização In Situ

Comparação entre Nanocompósitos de Polietileno/Nanotubos de Carbono e Polietileno/Nanolâminas de Grafeno Obtidos por Polimerização In Situ

Performant Clay/Carbon Nanotube Polymer Nanocomposites

Polyethylene Microtubes from Silica Fiber‐based Polyethylene Composites Synthesized by an In Situ Catalytic Method

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