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首页> 外文期刊>Journal of Applied Polymer Science >Polyvinyl alcohol/chitosan/carbon nanotubes electroactive shape memory nanocomposite hydrogels
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Polyvinyl alcohol/chitosan/carbon nanotubes electroactive shape memory nanocomposite hydrogels

机译：聚乙烯醇/壳聚糖/碳纳米管电活性形状记忆纳米复合水凝胶

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摘要

Shape memory nanocomposite hydrogels are intelligent soft materials in which, the nanoparticles can impart desirable mechanical properties to the polymeric matrix. The main challenge is the capability to program from permanent to temporary shapes and vice versa under the direct and indirect thermal stimuli. In this work, carbon nanotubes (CNT) with a high modulus of 1 TPa, was used to mechanically reinforce polyvinyl alcohol (PVA) and polyvinyl alcohol/chitosan (PVA/Cs) hydrogel networks. Adding appropriate amount of conductor component enables the system to be electrically activated, which leads to achieving the original permanent shape without applying mechanical external force. The PVA/Cs/CNT hydrogel containing 0.25 wt% of CNT, showed electrical conductivity greater than 9 mS cm(-1). Because of the presence of CNT, the shape memory behavior of PVA and PVA/Cs hydrogels was improved by 170 and 260%, respectively. The electroactive shape memory nanocomposite hydrogels exhibited complete recovery under indirect stimulation by generating Joule heating in the system.
机译：形状记忆纳米复合水凝胶是一种智能软材料，其中纳米颗粒可以赋予聚合物基体理想的机械性能。主要的挑战是在直接和间接的热刺激下，从永久形状到临时形状的编程能力，反之亦然。在这项工作中，碳纳米管（CNT）具有1 TPa的高模量，用于机械增强聚乙烯醇（PVA）和聚乙烯醇/壳聚糖（PVA/Cs）水凝胶网络。添加适量的导体组件可使系统电激活，从而在不施加机械外力的情况下实现原始永久形状。含有0.25 wt%碳纳米管的PVA/Cs/CNT水凝胶的电导率大于9 mS-cm（-1）。由于碳纳米管的存在，PVA和PVA/Cs水凝胶的形状记忆性能分别提高了170%和260%。电活性形状记忆纳米复合水凝胶通过在系统中产生焦耳加热，在间接刺激下表现出完全恢复。

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