In the present study, a multifunctional composite nanopaper was developed on the basis of soy protein isolate (SPI) from the synergistic reinforcement of sheet-like graphene (RGO) and platelet-like starch nanocrystals (SNCs), providing a conductive function as well as enhanced mechanical and barrier properties. As a highly crystalline and rigid nanoparticle derived from a natural polymer, the introduction of SNCs improved the dispersion of graphene nanoparticles at the relative ratio of 15/1 (SNC/RGO, w/w), and therefore promoted the electrical conductivity of the composite nanopapers under various humidity atmospheres. Because of hydrogen-bonding interactions from the surface groups, the effect of SNCs as a dispersing agent for RGO was investigated by rheological analysis of the composite suspensions and meanwhile directly observed by microscopy in the composite films. The proposed strategy of dual-enhanced fillers (with molecular interaction) in the composites can provide remarkable improvement of the properties, with simultaneous strengthening and toughening, water-vapor and oxygen permeability reduction, water absorption reduction, and solvent resistance, which may be a novel idea to solve the critical limitations of SPI-based materials in practical applications.

中文翻译：

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植物衍生的蛋白质对湿度敏感和导电的纳米纸，具有血小板样淀粉纳米晶体和片状石墨烯的协同作用

在本研究中，在大豆蛋白分离物（SPI）的基础上，从片状石墨烯（RGO）和血小板状淀粉纳米晶体（SNC）的协同增强作用中开发了一种多功能复合纳米纸，它不仅具有导电功能，而且增强的机械性能和阻隔性能。作为衍生自天然聚合物的高度结晶且刚性的纳米颗粒，SNC的引入以相对比率15/1（SNC / RGO，w / w）改善了石墨烯纳米颗粒的分散性，因此提高了复合材料的电导率各种湿度气氛下的纳米纸。由于表面基团之间存在氢键相互作用，通过对复合悬浮液的流变分析，研究了SNCs作为RGO分散剂的作用，同时通过显微镜在复合膜中直接观察到了SNCs的作用。所提出的复合材料中双重增强填料（具有分子相互作用）的策略可以显着改善性能，同时增强和增韧，降低水蒸气和氧气的渗透性，减少吸水率和耐溶剂性，这可能是一种解决基于SPI的材料在实际应用中的关键局限性的新颖想法。