Evaluation of CO2 permeation through functional assembled mono-layers: Relationships between structure and transport

Gugliuzza, Annarosa; Drioli, Enrico

doi:10.1016/j.polymer.2005.08.011

Cited by 27 publications

(25 citation statements)

References 26 publications

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“…Nesses sistemas há a presença de aglomerados de argila e má dispersão da carga inorgânica na matriz, que podem auxiliar no aumento da quantidade de microvazios na matriz polimérica, facilitando a difusão e aumentando, [4,7,23] . A adição de altos teores de agentes compatibilizantes no nanocompósito pode ter alguns efeitos como diminuição da densidade dos domínios cristalinos na blenda, causar aumento do caráter amorfo e flutuações no volume livre [26] . Por outro lado, auxilia no processo de quebra de tactóides e dispersão de lamelas de argila na matriz polimérica auxiliando no aumento do caminho difusional do gás.…”

Section: Passador F R Et Al -Nanocompósitos De Blendas Hdpe/lldpeunclassified

Nanocompósitos de Blendas HDPE/LLDPE e OMMT Parte II: Avaliação das Propriedades Térmica, Óticas e de Transporte a Gases

Passador¹,

Travain²,

Backes³

et al. 2013

Polímeros

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Resumo: Nanocompósitos de blendas de polietileno de alta densidade (HDPE) com polietileno linear de baixa densidade (LLDPE) e OMMT (montmorilonita organofílica) foram preparados sob fusão em extrusora de duplarosca, utilizando HDPE-g-MA como agente compatibilizante. Os nanocompósitos foram caracterizados através das propriedades térmicas, óticas e de transporte de gases. A blenda HDPE/LLDPE e os nanocompósitos das blendas HDPE/LLDPE como esperado comportam-se como barreira ao vapor de água e são permeáveis ao CO 2 e O 2 . A adição de nanoargila modificou o grau de cristalinidade da matriz polimérica dos nanocompósitos e a diminuição do coeficiente de permeabilidade foi atribuída ao aumento do grau de cristalinidade e do aumento ao caminho difusional para as moléculas do gás passarem pelo filme polimérico. O caminho difusional mais longo devido ao aumento da tortuosidade está relacionado a uma boa dispersão da carga inorgânica, boa molhabilidade desta pela matriz e forte interações na interface. Modelos teóricos de permeabilidade propostos por Nielsen e Bharadwaj foram utilizados para estimar a razão de aspecto da nanoargila nos nanocompósitos e forneceram resultados que se correlacionam bem com as morfologias observadas por microscopia eletrônica de transmissão. HDPE/LLDPE Blend-based Nanocomposites -Part II: Evaluation of Thermal, Optical and Transport PropertiesAbstract: High density polyethylene/ linear low density polyethylene (HDPE/LLDPE) blend-based nanocomposites were prepared in a twin-screw, using HDPE-g-MA as compatibilizer agent. The nanocomposites were characterized through thermal, optical and transport properties. The HDPE/LLDPE blend and the nanocomposites behave as a barrier to water vapor but are permeable to CO 2 e O 2 . The addition of organoclay modified the crystallinity degree of the polymer matrix of the nanocomposites. The reduction of the permeability coefficient of the nanocomposites was correlated to the increase in the crystallinity of the polymer matrix and to the increase in diffusional path of the gas due to the increase in the tortuosity related to a good dispersion of the clay platelets in the matrix. These effects are related also to a good wettability of the filler by the polymeric matrix and strong interactions at the interface. Theorical permeability models proposed by Nielsen and Bharadwaj were used to estimate the aspect ratio of the organoclay in the nanocomposites with correlate well with the images observed through transmission electron microscopy.

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Section: Passador F R Et Al -Nanocompósitos De Blendas Hdpe/lldpeunclassified

Nanocompósitos de Blendas HDPE/LLDPE e OMMT Parte II: Avaliação das Propriedades Térmica, Óticas e de Transporte a Gases

Passador¹,

Travain²,

Backes³

et al. 2013

Polímeros

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“…In the gas separation, for example, the first contact between feed and membrane occurs critically at the interface, affecting the sorption of penetrating molecules into the membrane [17][18][19]. The possibility to manipulate the membrane affinity appears to be a promising strategy for enhancing the efficiency of a process, especially when the sorption selectivity is the predominant parameter on the overall transport [6,20]. Recently, membranes based on a block co-(polyamide) have been chemically modified by blending the polymer with organic modifiers, bearing polar and non-polar moieties [7].…”

Section: Introductionmentioning

confidence: 99%

Study of the surface character as responsible for controlling interfacial forces at membrane–feed interface

Gugliuzza

Reniero

Garavaglia

et al. 2006

Journal of Colloid and Interface Science

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“…The reliability of the equilibrated PEBAX/KET models at different additive compositions (30 wt %, 50 wt %, 70 wt %) was also tested by comparing simulated permeability coefficients of five gas molecules, H 2 , O 2 , N 2 , CH 4 and CO 2 and water vapor with experimental data already available from Gugliuzza et al, [10][11][12]. Table 3 summarizes the theoretical transport parameters and the available experimental values for PEBAX/KET systems in different compositions.…”

Section: Gas and Vapor Permeabilitymentioning

confidence: 99%

“…Adding organic molecules with different chemical structures to a polymer matrix generally implies a modification of the system morphology, the chemical composition and even the physico-chemical properties change, influencing the transport through the membranes [8][9][10]. Previously, the effects of the addition of N-ethyl-o/p-toluene sulfonamide (KET) molecules on the gas permeation properties were investigated [11][12][13][14][15][16][17]. A clear trend of the influence of additives on gas permeability was observed: The gas transport properties of PEBAX improved with increasing additive concentration up to a certain value.…”

Section: Introductionmentioning

confidence: 99%

Pure And Modified Co-poly(amide-12-b-ethylene oxide) Membranes For Gas Separation Studied By Molecular Investigations

Tocci¹,

Lorenzo²,

Gugliuzza³

et al. 2010

AIP Conference Proceedings

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This paper deals with a theoretical investigation of gas transport properties in a pure and modified PEBAX block copolymer membrane with N-ethyl-o/p-toluene sulfonamide (KET) as additive molecules. Molecular dynamics simulations using COMPASS force field, Gusev-Suter Transition State Theory (TST) and Monte Carlo methods were used. Bulk models of PEBAX and PEBAX/KET in different copolymer/additive compositions were assembled and analyzed to evaluate gas permeability and morphology to characterize structure-performance relationships.

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Evaluation of CO2 permeation through functional assembled mono-layers: Relationships between structure and transport

Cited by 27 publications

References 26 publications

Nanocompósitos de Blendas HDPE/LLDPE e OMMT Parte II: Avaliação das Propriedades Térmica, Óticas e de Transporte a Gases

Nanocompósitos de Blendas HDPE/LLDPE e OMMT Parte II: Avaliação das Propriedades Térmica, Óticas e de Transporte a Gases

Study of the surface character as responsible for controlling interfacial forces at membrane–feed interface

Pure And Modified Co-poly(amide-12-b-ethylene oxide) Membranes For Gas Separation Studied By Molecular Investigations

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