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首页> 外文期刊>Advanced Functional Materials >Stiff and Transparent Multilayer Thin Films Prepared Through Hydrogen-Bonding Layer-by-Layer Assembly of Graphene and Polymer
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Stiff and Transparent Multilayer Thin Films Prepared Through Hydrogen-Bonding Layer-by-Layer Assembly of Graphene and Polymer

机译：石墨烯与聚合物逐层氢键组装制备的硬质透明多层薄膜

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摘要

Due to their exceptional orientation of 2D nanofillers, layer-by-layer (LbL) assembled polymer/graphene oxide thin films exhibit unmatched mechanical performance relative to any conventionally produced counterparts with similar composition. Unprecedented mechanical property improvement, by replacing graphene oxide with pristine graphene, is demonstrated in this work. Polyvinylpyrrolidone-stabilized graphene platelets are alternately deposited with poly(acrylic acid) using hydrogen bonding assisted LbL assembly. Transmission electron microscopy imaging and the Halpin-Tsai model are used to demonstrate, for the first time, that intact graphene can be processed from water to generate polymer nanocomposite thin films with simultaneous parallel-alignment, high packing density, and exfoliation. A multilayer thin film with only 3.9 vol% of highly exfoliated, and structurally intact graphene, increases the elastic modulus (E) of a polymer multilayer thin film by 322% (from 1.41 to 4.81 GPa), while maintaining visible light transmittance of approximate to 90%. This is one of the greatest improvements in elastic modulus ever reported for a graphene-filled polymer nanocomposite with a glassy (E > 1 GPa) matrix. The technique described here provides a powerful new tool to improve nanocomposite properties (mechanical, gas transport, etc.) that can be universally applied to a variety of polymer matrices and 2D nanoplatelets.
机译：由于2D纳米填料具有非凡的定向性，因此层-层（LbL）组装的聚合物/氧化石墨烯薄膜相对于具有相似组成的任何常规生产的同类产品，都具有无与伦比的机械性能。在这项工作中，证明了通过用原始石墨烯代替氧化石墨烯来前所未有地提高机械性能。聚乙烯吡咯烷酮稳定的石墨烯血小板通过氢键辅助的LbL组装与聚丙烯酸交替沉积。透射电子显微镜成像和Halpin-Tsai模型首次用于证明可以从水中加工完整的石墨烯，以生成同时平行排列，高堆积密度和剥离的聚合物纳米复合薄膜。高度剥落且结构完整的石墨烯仅3.9 vol％的多层薄膜，可使聚合物多层薄膜的弹性模量（E）增加322％（从1.41至4.81 GPa），同时保持约5％的可见光透射率。 90％。对于具有玻璃态（E> 1 GPa）基体的石墨烯填充的聚合物纳米复合材料，这是有史以来最大的弹性模量改进。此处描述的技术提供了一种功能强大的新工具，可改善纳米复合材料的性能（机械，气体传输等），可广泛应用于各种聚合物基质和2D纳米片上。

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