Chameleon-like elastomers with molecularly encoded strain-adaptive stiffening and coloration
Chameleon-like elastomers with molecularly encoded strain-adaptive stiffening and coloration
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DOI：
10.1126/science.aar5308
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发表时间：
2018-03-30
期刊：
影响因子：
56.9
通讯作者：
Sheiko, Sergei S.
中科院分区：
文献类型：
--
作者：
Vatankhah-Varnosfaderani, Mohammad;Keith, Andrew N.;Sheiko, Sergei S.
主动伪装被广泛认为是一种软组织特征，然而将适应性着色和组织类机械特性整合到合成材料中的能力仍然难以捉摸。我们提供了一种解决方案，通过线性-瓶刷-线性三嵌段共聚物的自组装，将这些功能结合在可塑弹性体中。微相分离的建筑不同的块导致物理交联的网络，显示出鲜艳的颜色，极端柔软，和强烈的应变硬化与皮肤组织相当。这些功能特性中的每一种都是由一个大分子的结构来调节的，而不需要化学交联或添加剂。这些材料在身体内部环境和环境条件下保持稳定，在体液中不会膨胀，暴露在空气中也不会干燥。
Active camouflage is widely recognized as a soft-tissue feature, and yet the ability to integrate adaptive coloration and tissuelike mechanical properties into synthetic materials remains elusive. We provide a solution to this problem by uniting these functions in moldable elastomers through the self-assembly of linear-bottlebrush-linear triblock copolymers. Microphase separation of the architecturally distinct blocks results in physically cross-linked networks that display vibrant color, extreme softness, and intense strain stiffening on par with that of skin tissue. Each of these functional properties is regulated by the structure of one macromolecule, without the need for chemical cross-linking or additives. These materials remain stable under conditions characteristic of internal bodily environments and under ambient conditions, neither swelling in bodily fluids nor drying when exposed to air.