Polymer-infiltrated nanoplatelet films with nacre-like structure via flow coating and capillary rise infiltration (CaRI)
Polymer-infiltrated nanoplatelet films with nacre-like structure via flow coating and capillary rise infiltration (CaRI)
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DOI：
10.1039/d0nr08691f
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发表时间：
2021-03-14
期刊：
影响因子：
6.7
通讯作者：
Lee, Daeyeon
中科院分区：
文献类型：
--
作者：
Qiang, Yiwei;Turner, Kevin T.;Lee, Daeyeon
高度各向异性的纳米材料在聚合物基体中的排列可以产生具有独特力学和输运性能的纳米复合材料。传统的纳米复合材料薄膜制造方法不适合制造具有非常高浓度的各向异性纳米材料的复合材料，这可能限制了这些有用结构的广泛实施。在这项工作中，我们提出了一种基于流动涂层和毛细上升渗透（CaRI）的可扩展制备聚合物渗透纳米板膜（pfs）的方法，并研究了这些pfs的加工-结构-性能关系。我们发现，利用流动镀膜工艺可以制备出与衬底平行排列的具有高宽高比（AR）三水铝(Al （OH)(3)）纳米片（NPTs）的薄膜。npt与赫尔曼序参数0.96和高填料分数bbb80 vol%高度一致。与低AR纳米颗粒（NP）填料相比，这种填料具有更高的断裂韧性。通过在聚合物薄膜上沉积NPT，然后在聚合物的玻璃化转变温度以上退火双分子层，聚合物通过毛细管作用渗透到弯曲的NPT填料中。我们观察到，与NP填料相比，聚合物渗透后NPT膜的模量、硬度和抗划伤性都有较大的增强。这种薄膜优异的机械性能得益于NPT之间热促进氧化物桥的形成以及聚合物的渗透，从而增加了NPT接触的强度。我们的方法广泛适用于高度各向异性的纳米材料，并允许生成机械坚固的聚合物纳米复合薄膜，用于各种应用。
Alignment of highly anisotropic nanomaterials in a polymer matrix can yield nanocomposites with unique mechanical and transport properties. Conventional methods of nanocomposite film fabrication are not well-suited for manufacturing composites with very high concentrations of anisotropic nanomaterials, potentially limiting the widespread implementation of these useful structures. In this work, we present a scalable approach to fabricate polymer-infiltrated nanoplatelet films (PINFs) based on flow coating and capillary rise infiltration (CaRI) and study the processing-structure-property relationship of these PINFs. We show that films with high aspect ratio (AR) gibbsite (Al (OH)(3)) nanoplatelets (NPTs) aligned parallel to the substrate can be prepared using a flow coating process. NPTs are highly aligned with a Herman's order parameter of 0.96 and a high packing fraction >80 vol%. Such packings show significantly higher fracture toughness compared to low AR nanoparticle (NP) packings. By depositing NPTs on a polymer film and subsequently annealing the bilayer above the glass transition temperature of the polymer, polymer infiltrates into the tortuous NPT packings though capillarity. We observe larger enhancement in the modulus, hardness and scratch resistance of NPT films upon polymer infiltration compared to NP packings. The excellent mechanical properties of such films benefit from both thermally promoted oxide bridge formation between NPTs as well as polymer infiltration increasing the strength of NPT contacts. Our approach is widely applicable to highly anisotropic nanomaterials and allows the generation of mechanically robust polymer nanocomposite films for a diverse set of applications.