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首页> 外文期刊>Advanced Functional Materials >Toughness and Fracture Properties in Nacre-Mimetic Clay/Polymer Nanocomposites
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Toughness and Fracture Properties in Nacre-Mimetic Clay/Polymer Nanocomposites

机译：珍珠母模拟粘土/聚合物纳米复合材料的韧性和断裂性能

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Nacre inspires researchers by combining stiffness with toughness by its unique microstructure of aligned aragonite platelets. This brick-and-mortar structure of reinforcing platelets separated with thin organic matrix has been replicated in numerous mimics that can be divided into two categories: microcomposites with aligned metal oxide microplatelets in polymer matrix, and nanocomposites with self-assembled nanoplateletsusually clay or graphene oxideand polymer. While microcomposites have shown exceptional fracture toughness, current fabrication methods have limited nacre-mimetic nanocomposites to thin films where fracture properties remained unexplored. Yet, fracture resistance is the defining property of nacre, therefore centrally important in any mimic. Furthermore, to make use of these properties in applications, bulk materials are required. Here, up to centimeter-thick nacre-mimetic clay/polymer nanocomposites are produced by the lamination of self-assembled films. The aligned clay nanoplatelets are separated by poly(vinyl alcohol) matrix, with 10(6)-10(7) nanoplatelets on top of each other in the bulk plates. Fracture testing shows crack deflection and a fracture toughness of 3.4 MPa m(1/2), not far from nacre. Flexural tests show high stiffness (25 GPa) and strength (220 MPa) that, despite the hydrophilic constituents, are not substantially affected by exposure to humidity.
机译：Nacre通过排列的文石片状片独特的微观结构将刚度和韧性相结合，激发了研究人员的灵感。这种用薄有机基质隔开的增强血小板的实体结构已经在许多模拟物中得到了复制，这些模仿物可以分为两类：在聚合物基质中具有对齐的金属氧化物微片的微复合物，以及具有自组装纳米片的纳米复合物，通常是粘土或氧化石墨烯。聚合物。尽管微复合材料显示出优异的断裂韧性，但目前的制造方法已将模拟珍珠母的纳米复合材料局限于薄膜，在这些薄膜中，断裂性能尚待探索。然而，抗断裂性是珍珠母的决定性属性，因此在任何模拟物中都至关重要。此外，为了在应用中利用这些特性，需要散装材料。在此，通过层压自组装膜可生产高达厘米厚的类似珍珠质的粘土/聚合物纳米复合材料。对齐的粘土纳米片被聚乙烯醇基质隔开，在散装板中彼此叠置的是10（6）-10（7）纳米片。断裂测试显示裂纹挠度和3.4 MPa m（1/2）的断裂韧性，离珍珠层不远。弯曲测试显示出高的刚度（25 GPa）和强度（220 MPa），尽管具有亲水性成分，但基本上不受湿度影响。

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