Three-Dimensional Polymer Constructs Exhibiting a Tunable Negative Poisson's Ratio.
Three-Dimensional Polymer Constructs Exhibiting a Tunable Negative Poisson's Ratio.
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DOI：
10.1002/adfm.201002022
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发表时间：
2011-07-22
影响因子：
19
通讯作者：
Chen, Shaochen
中科院分区：
文献类型：
--
作者：
Fozdar, David Y.;Soman, Pranav;Lee, Jin Woo;Han, Li-Hsin;Chen, Shaochen
多孔聚合物结构（支架）的杨氏模量和泊松比定量描述了它如何支撑外部应力并将其传递到周围环境。虽然杨氏模量总是非负的，并且在量值上高度可调，但泊松比确实可以取负值，尽管事实上它对于几乎每种天然存在的和人造的材料都是非负的。在一些应用中，具有可调负泊松比的构建体（拉胀构建体）可能更适合于支撑由其环境施加在其上的外力。在这里，三维聚乙二醇支架与可调负泊松比制造。数字微影设备投影打印（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）组成的单层结构。单位细胞结构的存在调谐泊松比的大小和极性（正或负）。多层结构是用DMD-PP通过将单层结构与垂直连接柱的交替层堆叠来制造的。单层和多层结构的泊松比由应变实验确定，这表明（1）结构的泊松比由分析变形模型准确预测，以及（2）多层结构中的层之间没有发生滑动，并且添加新层不会影响泊松比。
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.
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影响因子：
64.8
作者：
BAUGHMAN, RH;GALVAO, DS
通讯作者：
GALVAO, DS
影响因子：
4.5
作者：
CHOI, JB;LAKES, RS
通讯作者：
LAKES, RS
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56.9
作者：
Baughman, RH;Stafström, S;Dantas, SO
通讯作者：
Dantas, SO
影响因子：
2.9
作者：
CHOI, JB;LAKES, RS
通讯作者：
LAKES, RS
影响因子：
56.9
作者：
Hall, Lee J.;Coluci, Vitor R.;Baughman, Ray H.
通讯作者：
Baughman, Ray H.