Magnetoactive Thermoplastic Elastomers with Bottlebrush Strands: Switching and Programming of Mechanical Properties by a Magnetic Field
Magnetoactive Thermoplastic Elastomers with Bottlebrush Strands: Switching and Programming of Mechanical Properties by a Magnetic Field
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DOI：
10.1021/acsapm.3c01334
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发表时间：
2023-08
影响因子：
5
通讯作者：
S. A. Kostrov;Mitchell R. Maw;S. Sheiko;E. Kramarenko
中科院分区：
文献类型：
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作者：
S. A. Kostrov;Mitchell R. Maw;S. Sheiko;E. Kramarenko
我们报告了一类基于填充磁性羰基铁微粒的A-g-B瓶刷接枝共聚物的独特磁活性热塑性弹性体（MATE）。A-g-B共聚物形成无溶剂的弹性体基质，提供仿组织柔软性和应变硬化，沿着在特定流动温度以上模塑的能力。与共价交联的磁活性弹性体相反，MATE的机械性能和磁响应可以通过在磁场中在增强的温度下的颗粒重排来改变。这种热磁处理将MATE从各向同性转变为各向异性复合材料，弹性模量增加近三倍，阻尼因子降低高达25%，磁流变效应增强高达7.5倍。重新编程MATE的形状和粘弹性的能力对生物医学设备和软机器人的未来具有重要意义。
We report on a distinct class of magnetoactive thermoplastic elastomers (MATEs) based on A-g-B bottlebrush graft copolymers filled with magnetic carbonyl iron microparticles. The A-g-B copolymers form a solvent-free elastomeric matrix providing tissue-mimetic softness and strain-stiffening, along with the capability of molding above a specific flow temperature. In contrast to covalently cross-linked magnetoactive elastomers, the mechanical properties and magnetic response of MATEs can be altered through particle rearrangement in a magnetic field at enhanced temperatures. This thermo-magnetic processing transforms the MATE from an isotropic to anisotropic composite with near three-fold increase in elastic modulus, up to 25% decrease in the damping factor, and up to 7.5-fold enhancement of the magnetorheological effect. The ability to reprogram the shape and viscoelasticity of MATEs has vital implications for the future of biomedical devices and soft robotics.