Polymer Nanocomposite Film with Metal Rich Surface Prepared by In Situ Single-Step Formation of Palladium Nanoparticles: An Interesting Way to Combine Specific Functional Properties

This paper presents a continuous single-step route that permits preparation of a thermostable polymer/metal nanocomposite film and to combine different functional properties in a unique material. More precisely, palladium nanoparticles are in situ generated in a polyimide matrix thanks to a designed curing cycle which is applied to a polyamic acid/metal precursor solution cast on a glass plate. A metal-rich surface layer which is strongly bonded to the bulk film is formed in addition to homogeneously dispersed metal nanoparticles. This specific morphology leads to obtaining an optically reflective film. The metal nanoparticles act as gas diffusion barriers for helium, oxygen, and carbon dioxide; they induce a tortuosity effect which allows dividing the gas permeation coefficients by a factor near to 2 with respect to the neat polyimide matrix. Moreover, the ability of the in situ synthesized palladium nanoparticles to entrap hydrogen is evidenced. The nanocomposite film properties can be modulated as a function of the location of the film metal-rich surface with respect to the hydrogen feed. The synthesized nanocomposite could represent a major interest for a wide variety of applications, from specific coatings for aerospace or automotive industry, to catalysis applications or sensors

Nanocomposites for gas barrier applications: Governing factors, single and coupled effects, new routes to optimise the function properties

The objectives of this feature paper are to analyse, from our work results, gas barrier properties of nanocomposites made from different nanofiller types and synthesis routes. An overview of the governing parameters will be made and it will be shown how these different parameters can be adapted or combined to optimise these functional properties. It will also be demonstrated the interest of modelling approaches (going from analytical to numerical 3D finite element modelling) when used in complementarity with experimental studies for a better understanding of the transport mechanisms involved as for the determination of the most suitable morphologies for a given function property level. The interest of exploiting gas transport as a tool to probe the materials, especially the interphases, will also be highlighted. Finally new development routes under investigation will be given

Nanocomposites à charges lamellaires. Rôle de la dispersion et des interactions charges/matrices sur les propriétés barrière

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Mass transfer properties in polymer nanocomposites

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Control of the gas diffusion and interaction in nanocomposites: from high gas barrier materials to active membranes

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Nanocomposites à charges lamellaires et applications barrière

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Mass transfer properties in polymer nanocomposites

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Gas diffusion in nanocomposites: from high gas barrier materials to active membranes

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Propriétés barrière de films éco-conçus

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