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首页> 美国卫生研究院文献>Nanomaterials >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
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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

机译：原位一步形成钯纳米粒子制备的具有富金属表面的聚合物纳米复合膜：结合特定功能特性的有趣方式

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摘要

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.
机译：本文提出了一种连续的单步路线，该路线允许制备热稳定的聚合物/金属纳米复合膜，并在独特的材料中结合不同的功能特性。更精确地说，由于设计的固化周期，钯纳米颗粒在聚酰亚胺基体中原位生成，该固化周期应用于浇铸在玻璃板上的聚酰胺酸/金属前体溶液。除了均匀分散的金属纳米颗粒之外，还形成了牢固结合到块状膜的富金属表面层。这种特定的形态导致获得光学反射膜。金属纳米颗粒充当氦气，氧气和二氧化碳的气体扩散屏障；它们会产生曲折效应，从而相对于纯净的聚酰亚胺基体，可以将气体渗透系数除以接近2的倍数。而且，证明了原位合成的钯纳米颗粒捕获氢的能力。可以根据富含膜的金属表面相对于氢气进料的位置来调节纳米复合膜的性能。合成的纳米复合材料可能代表着广泛的应用范围，从航空航天或汽车工业的特定涂层到催化应用或传感器，应有尽有。

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