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首页> 外文期刊>Surface & Coatings Technology >Influence of layer-by-layer deposition techniques and incorporation of layered double hydroxides (LDH) on the morphology and gas barrier properties of polyelectrolytes multilayer thin films
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Influence of layer-by-layer deposition techniques and incorporation of layered double hydroxides (LDH) on the morphology and gas barrier properties of polyelectrolytes multilayer thin films

机译：层逐层沉积技术的影响和层状双氢氧化物（LDH）的掺入对多层薄膜的形态和气体阻隔性能

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摘要

The spin-spray layer-by-layer (SS-LBL) deposition technique was utilized to produce multilayer films of poly (acrylic acid) (PAA)/poly(ethylene imine) (PEI) with and without nanoparticles of layered double hydroxides (LDH), and the structure and gas barrier properties of the films were compared with those produced by the dipping layer-by-layer technique (dipping-LBL). The thickness growth of dipping-LBL films is clearly exponential, whereas the SS-LBL films exhibited a lower growth rate. Microscopy analysis revealed that the roughness is much lower, and the orientation and planarization of the LDH nanoplatelets is higher, in SS-LBL films than in dipping-LBL films. LBL films deposited on PET substrates resulted in large reductions in the gas permeabilities compared with neat PET, and this barrier effect is more intense for films deposited by SS-LBL containing LDH nanoparticles. For these films, oxygen and carbon dioxide gas permeation reductions of about 10 x and 50 x, respectively, were observed after only 5 deposition cycles of the sequence (PEI/PAA/LDH/PAA). Besides the higher efficiency of SS-LBL in decreasing the gas permeability, this deposition technique is also 20 times faster than dipping-LBL, and the coated films have higher light transmittance. This combination of high gas barrier, fast assembly, and high optical clarity of polymer/LDH composite nanocoatings is expected to be very attractive in the production of films for food packaging and electronic encapsulation applications.
机译：利用自旋喷涂层逐层（SS-LBL）沉积技术，用于产生多层薄膜的聚（丙烯酸）（PAA）/聚（乙烯亚胺）（PEI），并没有层状双氢氧化物的纳米颗粒（LDH ），将薄膜的结构和阻气性与通过浸渍层逐层技术（Dipping-LBL）进行比较。浸渍-LBL薄膜的厚度生长显然是指数的，而SS-LBL薄膜表现出较低的生长速率。显微镜分析显示，粗糙度低得多，并且LDH纳米孔的取向和平坦化较高，在SS-LBL薄膜中比在浸渍-LBL薄膜中更高。沉积在PET底物上的LBL薄膜导致气体渗透率的较大减少与整齐的宠物相比，并且这种阻挡效果对含有LDH纳米颗粒的SS-LBL沉积的薄膜更强烈。对于这些膜的这些薄膜，分别仅在序列的5个沉积循环（PEI / PAA / LDH / PAA）之后观察到约10×和50×的氧气和二氧化碳气体渗透。除了SS-LBL的效率较高，在降低透气性下，该沉积技术也比浸渍-LBL快20倍，涂覆的膜具有更高的透光率。这种高气体屏障，快速组装和高光学透明度的聚合物/ LDH复合纳米织物的组合预计在用于食品包装和电子封装应用的薄膜中非常有吸引力。

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