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首页> 外文期刊>Nanotechnology >Stimuli-responsive transformation in carbon nanotube/expanding microsphere-polymer composites
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Stimuli-responsive transformation in carbon nanotube/expanding microsphere-polymer composites

机译：碳纳米管/膨胀微球-聚合物复合材料中的刺激响应转变

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摘要

Our work introduces a class of stimuli-responsive expanding polymer composites with the ability to unidirectionally transform their physical dimensions, elastic modulus, density, and electrical resistance. Carbon nanotubes and core-shell acrylic microspheres were dispersed in polydimethylsiloxane, resulting in composites that exhibit a binary set of material properties. Upon thermal or infrared stimuli, the liquid cores encapsulated within the microspheres vaporize, expanding the surrounding shells and stretching the matrix. The microsphere expansion results in visible dimensional changes, regions of reduced polymeric chain mobility, nanotube tensioning, and overall elastic to plastic-like transformation of the composite. Here, we show composite transformations including macroscopic volume expansion (>500%), density reduction (>80%), and elastic modulus increase (>675%). Additionally, conductive nanotubes allow for remote expansion monitoring and exhibit distinct loading-dependent electrical responses. With the ability to pattern regions of tailorable expansion, strength, and electrical resistance into a single polymer skin, these composites present opportunities as structural and electrical building blocks in smart systems.
机译：我们的工作介绍了一类具有刺激响应能力的膨胀聚合物复合材料，能够单向改变其物理尺寸，弹性模量，密度和电阻。将碳纳米管和核壳丙烯酸微球分散在聚二甲基硅氧烷中，得到的复合材料表现出二元一组的材料性能。在热或红外刺激下，包裹在微球内的液芯蒸发，使周围的壳膨胀并拉伸基质。微球膨胀导致可见的尺寸变化，聚合物链迁移率降低的区域，纳米管张紧以及复合材料的整体弹性到塑料状转变。在这里，我们显示了复合转换，包括宏观体积膨胀（> 500％），密度降低（> 80％）和弹性模量增加（> 675％）。此外，导电纳米管可进行远程扩展监测，并表现出不同的负载相关电响应。这些复合材料具有将可调整的扩展，强度和电阻区域图案化为单个聚合物表皮的能力，因此它们在智能系统中作为结构和电气构建块提供了机会。

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