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Three-Dimensional Polymer Constructs Exhibiting a Tunable Negative Poisson's Ratio

机译：具有可调负泊松比的三维聚合物构造

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摘要

Young's modulus and Poisson's ratio of a porous polymeric construct (scaffold) quantitatively describe how it supports and transmits external stresses to its surroundings. While Young's modulus is always non-negative and highly tunable in magnitude, Poisson's ratio can, indeed, take on negative values despite the fact that it is non-negative for virtually every naturally occurring and artificial material. In some applications, a construct having a tunable negative Poisson's ratio (an auxetic construct) may be more suitable for supporting the external forces imposed upon it by its environment. Here, three-dimensional polyethylene glycol scaffolds with tunable negative Poisson's ratios are fabricated. Digital micromirror device projection printing (DMD-PP) is used to print single-layer constructs composed of cellular structures (pores) with special geometries, arrangements, and deformation mechanisms. The presence of the unit-cellular structures tunes the magnitude and polarity (positive or negative) of Poisson's ratio. Multilayer constructs are fabricated with DMD-PP by stacking the single-layer constructs with alternating layers of vertical connecting posts. The Poisson's ratios of the single- and multilayer constructs are determined from strain experiments, which show (1) that the Poisson's ratios of the constructs are accurately predicted by analytical deformation models and (2) that no slipping occurrs between layers in the multilayer constructs and the addition of new layers does not affect Poisson's ratio.
机译：多孔聚合物结构（支架）的杨氏模量和泊松比定量描述了多孔聚合物结构如何支撑外部应力并将其传递到周围环境。尽管杨氏模量始终是非负的并且幅度可高度调整，但泊松比实际上可以取负值，尽管事实上对于几乎所有天然存在的和人造的材料它都是非负的。在一些应用中，具有可调的负泊松比的构造（膨胀构造）可能更适合于支撑其环境所施加的外力。在此，制造具有可调的负泊松比的三维聚乙二醇支架。数字微镜设备投影打印（DMD-PP）用于打印由具有特殊几何形状，排列和变形机制的细胞结构（孔）组成的单层构造。单元细胞结构的存在调整了泊松比的大小和极性（正或负）。通过将单层结构与垂直连接柱的交替层堆叠在一起，可以使用DMD-PP制造多层结构。单层和多层结构的泊松比由应变实验确定，这表明（1）通过分析变形模型可以准确预测结构的泊松比；（2）多层结构中各层之间无滑移发生，并且添加新层不会影响泊松比。

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  • 来源
    《Advanced Functional Materials》 |2011年第14期|p.2712-2720|共9页
  • 作者

    David Y. Fozdar; Pranav Soman; Jin Woo Lee; Li-Hsin Han; Shaochen Chen;

  • 作者单位

    Department of Mechanical Engineering The University of Texas at Austin 204 E. Dean Keaton St., ETC 1.210A, Austin, TX 78712, USA;

    Department of NanoEngineering University of California San Diego, 9500 Cilman Drive Atkinson Hall, MC-0448, La Jolla, CA 92093, USA;

    Department of NanoEngineering University of California San Diego, 9500 Cilman Drive Atkinson Hall, MC-0448, La Jolla, CA 92093, USA;

    Department of Orthopaedic Surgery Stanford University School of Medicine 300 Pasteur Dr., Edwards R132, Stanford, CA 94305, USA;

    Department of NanoEngineering University of California San Diego, 9500 Cilman Drive Atkinson Hall, MC-0448, La Jolla, CA 92093, USA;

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