Thermomechanically Triggered Two‐Stage Pattern Switching of 2D Lattices for Adaptive Structures,Advanced Functional Materials

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Thermomechanically Triggered Two‐Stage Pattern Switching of 2D Lattices for Adaptive Structures
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-03-07 , DOI: 10.1002/adfm.201705727
Chao Yuan _{1,

2} , Xiaoming Mu _{1,

3} , Conner K. Dunn ₁ , Jamal Haidar ₁ , Tiejun Wang ₂ , H. Jerry Qi ₁

Affiliation

Pattern switching (or transformation) widely exists in the activities of various creatures and plays an important role in designing adaptive structures in modern materials. Utilizing the glass transition behavior in amorphous polymers, thermomechanically triggered two‐stage pattern switching of 2D lattices is achieved, where components made of an amorphous polymer and a flexible elastomer are interconnected in predesigned layouts. Upon loading at room temperature, the elastomer is far more flexible than the amorphous polymer and the lattice switches into one pattern. With temperature increasing, the modulus of the amorphous polymer decreases due to glass transition. Under the proper choice of amorphous polymer whose storage modulus can decrease to below the modulus of the elastomer, a change in the relative stiffness can be achieved and can switch the overall pattern from one to another while maintaining the external load. Both the experimental and computational studies are carried out to investigate the switching mechanism. Several periodic structures are fabricated to demonstrate several switched patterns. Particularly, a proof‐of‐concept smart window design is fabricated to explore the potential engineering applications.

中文翻译：

用于自适应结构的二维晶格热机械触发的两阶段模式切换

模式转换（或转换）广泛存在于各种生物的活动中，并且在设计现代材料的自适应结构中起着重要作用。利用非晶态聚合物的玻璃化转变行为，实现了热机械触发的二维晶格的两阶段图案切换，其中非晶态聚合物和柔性弹性体制成的组件以预先设计的布局互连。在室温下加载时，弹性体比无定形聚合物具有更大的柔韧性，并且晶格转换成一种图案。随着温度升高，无定形聚合物的模量由于玻璃化转变而降低。下的无定形聚合物，其储能模量可降低到弹性体的模量低于适当的选择，可以实现相对刚度的变化，并且可以在保持外部负载的同时将整个模式从一个模式切换到另一个模式。进行了实验和计算研究，以研究切换机理。制造了几种周期性结构以展示几种开关模式。特别是，设计了概念验证的智能窗口设计来探索潜在的工程应用。

更新日期：2018-03-07

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