通过使用动态共价化学,对机械元材料进行空间选择性重构
Tansu Abbasoglu1, Oliver Skarsetz2, Paula Fanlo1
1POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avda. Tolosa 72, Donostia-San Sebastián, 20018, Spain.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 23, 2024
概括
本研究介绍了使用可适应的聚合物网络重新配置的机械超材料. 这些材料允许本地和全球的形状变化,使可调节的Poisson成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 聚合物化学 聚合物化学
背景情况:
- 机械超材料通过周期性结构提供独特的特性,但通常在制造后固定.
- 现有的形状可重构的超材料往往专注于全球变化,限制了当地控制.
- 有效材料属性的动态调整,例如Poisson比率,仍然是一个未被充分探索的领域.
研究的目的:
- 引入一种使用非异酸聚氨弹性体共价可适应网络 (CAN) 的新型可重新配置的元材料.
- 展示本地和全球形状重编程能力及其对波桑比率的影响.
- 探索电热加热以实现按需,空间控制的重塑和属性调整.
主要方法:
- 将可热重构的弹性 CAN 集成到辅助性和蜂型超材料架构中.
- 通过改变单元单元的角度来修改Poisson比的结构重新配置.
- 用于局部和全球电热加热的碳纳米管的沉积.
- 有限元模拟用于分析几何重新配置和属性变化.
主要成果:
- 通过结构重构实现了Poisson比率的本地和全球重编程.
- 在auxetic (从-1.4到-0.4) 和蜂型 (从+0.7到+0.2) 的元材料中证明了Poisson比率的显著变化.
- 通过受控的电热加热,实现了异质的Poisson比率 (-2到≈0用于辅助剂, +0.6到≈0用于蜂).
结论:
- 开发的基于CAN的元材料提供了永久的,按需的形状重新配置性.
- 对元材料几何学的本地和全球控制转化为可调节的有效机械性能.
- 这项工作为具有空间控制功能的先进适应性和可编程材料铺平了道路.
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