Barrier properties of polypropylene/organoclay nanocomposites

Dumont, Marie‐Josée; Reyna-Valencia, Alejandra; Émond, Jean-Pierre; Bousmina, M.

doi:10.1002/app.25253

Cited by 48 publications

(39 citation statements)

References 16 publications

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“…Nanocompósitos compatibilizados com EVOH (P415OHAPO) apresentam morfologia intercalada ordenada caracterizada pelo perfil do plano difratado (001) da argila, bem definido cuja abertura corresponde a 3,65 nm. Por outro lado, quando os nanocompósitos foram compatibilizados com PP-g-AM (P415AMAPO), a distância interplanar basal da argila (001) foi superior a 3,65 nm e uma banda é observada sugerindo que neste caso nanocompósitos com estrutura intercalada desordenada foram obtidos devido a maior penetração das cadeias poliméricas entre as camadas da argila [15,17,38] . Embora nanocompósitos tenham sido obtidos quando os sistemas PP/argila organofílica APO foram compatibilizados com EVOH e PP-g-AM, o último mostrou um melhor efeito compatibilizante devido à maior abertura do plano basal (intercalação) juntamente com a quebra parcial da estrutura cristalina (esfoliação parcial) da argila.…”

Section: Resultsunclassified

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Araújo¹,

Mesquita²,

Canedo³

et al. 2012

Polímeros

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Resumo: Neste trabalho foram preparados filmes de nanocompósitos de polipropileno (PP) contendo 1% em massa de bentonita modificada organicamente com tecnologia nacional (APO). Polipropileno enxertado com anidrido maleico (PP-g-AM) e copolímero de etileno e álcool vinílico (EVOH) foram utilizados como agentes compatibilizantes. Os nanocompósitos foram preparados através da intercalação no estado fundido em extrusora de filme plano. A influência do tipo e do teor de compatibilizante e do tipo de polipropileno, na morfologia, propriedades mecânicas e de barreira ao vapor d'água dos referidos filmes foi investigada. Os dados de difração de raio X evidenciam que apesar da morfologia dos nanocompósitos ter sido afetada pelo tipo de compatibilizante, esta praticamente não variou com o teor de compatibilizante utilizado. As morfologias e as propriedades de barreira ao vapor d'água dos nanocompósitos preparados com os polipropilenos PP H401 e PP H07D-00 são semelhantes. Entretanto, aqueles preparados com PP H07D-00 apresentaram melhores propriedades mecânicas, excetuando a resistência da termossoldagem à tração, do que os preparados com a matriz polimérica PP H401, e a transparência dos nanocompósitos preparados com PP H07D-00 foi idêntica à da matriz polimérica sem argila. Os resultados indicam que os filmes de nanocompósitos PP H07D-00 compatibilizados com 15% de PP-g-AM e contendo 1% de argila organofílica APO podem ser promissores para aplicação em embalagens. Palavras-chave: Filmes de nanocompósitos, argila organofílica, polipropileno, compatibilizante. Development of Polypropylene/Organoclay Nanocomposite Films for PackagingAbstract: This work deals with polypropylene (PP) nanocomposite films containing 1 wt. (%) bentonite clay organically modified with national technology (APO). Maleic anhydride grafted polypropylene (PP-g-MA) and ethylene vinyl alcohol (EVOH) were used as compatibilizing agents. Nanocomposites were prepared by melt intercalation in a flat film extruder. An investigation was made of the influence from the type and content of compatibilizer and type of polypropylene on the morphology, mechanical properties and barrier properties to water vapor of these films. X-ray diffraction data show that while the nanocomposite morphology was affected by the type of compatibilizer, it was relatively insensitive to its content. The morphologies and barrier properties to water vapor of the nanocomposites prepared with the two polypropylenes (PP H401 and PP H07D-00) were similar. However, except for the heat sealing properties, those prepared with PP H07D-00 showed better mechanical properties. The transparency of P715AMAPO nanocomposite was similar to that of the P715AM matrix. The results indicated that PP H07D-00 nanocomposite films compatibilized with 15% PP-g-AM and containing 1% APO organoclay may be promising for packaging applications. Keywords: Nanocomposite films, organoclay, polypropylene, compatibilizer. IntroduçãoCom o advento dos nanocompósitos poliméricos, as indústrias de embalagens vêm vislumbran...

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Section: Resultsunclassified

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Araújo¹,

Mesquita²,

Canedo³

et al. 2012

Polímeros

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“…Thus, even though the individual MA group interactions with the silicate are weaker than the corresponding ammonium cation interactions with the silicate layers, 28 the MA-treated PP can promote the formation of a filler network structure -and consequently result in a solid-like rheological response-because of their ability to effectively bridge silicate sheets. Similar filler networks, and the same qualitative rheological trend, have also been observed in montmorillonite filled nanocomposites of polyolefin random copolymers, 8 namely polyethylene-randomvinyl acetate (EVA); however, for these EVA systems, a much higher polar comonomer fraction is necessary (28 wt % of VA was used in that study 8 ) to achieve a comparable solidlike response with the one observed here.…”

Section: Thermal Characterizationmentioning

confidence: 99%

Tailored Nanocomposites of Polypropylene with Layered Silicates

Nakajima

Manias

et al. 2009

Macromolecules

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The melt rheological properties of layered silicate nanocomposites with maleic anhydride (MA) functionalized polypropylene are contrasted to those based on ammonium-terminated polypropylene. While the MA functionalized PP based nanocomposites exhibit solid-like linear viscoelastic behavior, consistent with the formation of a long-lived percolated nanoparticle network, the single-end ammonium functionalized PP based nanocomposites demonstrated liquid-like behavior at comparable montmorillonite concentrations. The differences in the linear viscoelasticity are attributed to the presence of bridging interactions in MA functionalized nanocomposites. Further, the transient shear stress of the MA functionalized nanocomposites in start-up of steady shear is a function of the shear strain alone, and the steady shear response is consistent with that of non-Brownian systems. The weak dependence of the steady first normal stress difference on the steady shear stress suggests that the polymer chain mediated silicate network contributes to such unique flow behavior.

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“…Through the incorporation of nano-sized particles into a pure polymer matrix, and through proper dispersion and orientation of these particles, significant reduction of the gas permeability can be achieved [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. These fillers create a tortuous path or maze which restricts the migration of the diffusing gas molecules through the polymer matrix by increasing the path length.…”

Section: Introductionmentioning

confidence: 99%

Improving the helium gas barrier properties of epoxy coatings through the incorporation of graphene nanoplatelets and the influence of preparation techniques

Rooyen

Karger‐Kocsis

Kock

2015

J of Applied Polymer Sci

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Graphene/epoxy nanocomposite coatings were formulated by applying different dispersion and preparation methods to determine whether the coatings might be a potential gas barrier material for irradiated graphite waste which is known to release radioactive gases like tritium ( 3 H2). Helium was used as a substitute gas for tritium and the gas permeability was measured with the use of a helium leak detector. The dispersion and fabrication techniques influenced the abillity of the coatings to reduce the helium gas permeability. Characterisation of the graphene nanoplatelets and the composite morphology showed that the dispersion techniques influenced the graphene nanoplatelet geometry which reduced the aspect ratio of the platelets. The results showed that by incorporating 2 wt% graphene into the epoxy matrix, combined with a multilayer fabrication method, reduced the helium gas permeability by 83% when compared to the reference epoxy samples. Modelling the gas permeability 2 according to the tortuous path theory confirmed the aspect ratios which were estimated by the microscopic methods and particle size analysis.

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Barrier properties of polypropylene/organoclay nanocomposites

Cited by 48 publications

References 16 publications

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Tailored Nanocomposites of Polypropylene with Layered Silicates

Improving the helium gas barrier properties of epoxy coatings through the incorporation of graphene nanoplatelets and the influence of preparation techniques

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