材料科学
纳米复合材料
碳纳米管
聚合物
复合材料
执行机构
制作
形状记忆聚合物
纳米技术
聚合物纳米复合材料
纳米尺度
医学
电气工程
工程类
替代医学
病理
作者
Kun Chen,Meng Li,Zi-Fan Yang,Ziming Ye,Ding Zhang,Bo Zhao,Zhiyuan Xia,Qi Wang,Xianghao Kong,Yuanyuan Shang,Chenyang Liu,Haifeng Yu,Anyuan Cao
标识
DOI:10.1002/adma.202313354
摘要
Abstract Stimulus‐responsive polymer‐based actuators are extensively studied, with the challenging goal of achieving comprehensive performance metrics that include large output stress and strain, fast response, and versatile actuation modes. The design and fabrication of nanocomposites offer a promising route to integrate the advantages of both polymers and nanoscale fillers, thus ensuring superior performance. Here, it is started from a three‐dimensional (3D) porous sponge to fabricate a mutually interpenetrated nanocomposite, in which the embedded carbon nanotube (CNT) network undergoes collective deformation with the shape memory polymer (SMP) matrix during large‐degree stretching and releasing, increases junction density with polymer chains and enhances molecular orientation. These features result in substantial improvement of the overall mechanical properties and during thermally actuated contraction, the bulk SMP/CNT composites exhibit output stresses up to 19.5 ± 0.97 MPa and strains up to 69%, accompanied by a rapid response and high energy density, exceeding the majority of recent reports. Furthermore, electrical actuation is also demonstrated via uniform Joule heating across the self‐percolated CNT network. Applications such as low‐temperature thermal actuated vascular stent and wound dressing are explored. These findings lay out a universal blueprint for developing robust and highly deformable SMP/CNT nanocomposite actuators with broad potential applications.
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