Thermoresponsive, Recyclable, Conductive, and Healable Polymer Nanocomposites with Three Distinct Dynamic Bonds
Thermoresponsive, Recyclable, Conductive, and Healable Polymer Nanocomposites with Three Distinct Dynamic Bonds
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DOI：
10.1021/acsapm.2c00790
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发表时间：
2022-09-09
影响因子：
5
通讯作者：
Konkolewicz, Dominik
中科院分区：
文献类型：
--
作者：
Dodo, Obed J.;Petit, Leilah;Konkolewicz, Dominik
将多种类型的动态连接整合到一个聚合物网络中是具有挑战性的，并且特别是在动态聚合物纳米复合材料（DPN）的设计和制造中没有得到很好的理解。在这篇文章中，我们提出了简单的方法，用于合成灵活的，可愈合的，导电的，可回收的温敏DPN使用三个动态化学起着不同的作用。动态氢键解释了材料的柔韧性和可回收性。硫醇-迈克尔交换占热响应特性。Diels-Alder反应导致聚合物基体和纳米复合材料之间的共价键合。总的来说，多种类型的正交动态粘结的存在为DPN中增强的机械性能和材料伸长率之间的权衡提供了解决方案。使用<1wt%的多壁碳纳米管作为纳米复合材料实现了有效的增强。与未增强材料相比，所得DPN显示出优异的可愈合性，应力增加超过3 MPa。由于多个响应动态链接，观察到> 90%的应力松弛，在愈合时间的1小时内实现自愈。在保持材料柔韧性和延展性的同时，实现了机械强度、导电性和可再加工性的提高，因此突出了这些DPN在快速增长的柔性顺应性电极和应变传感器领域的强大前景。
Integration of multiple types of dynamic linkages into one polymer network is challenging and not well understood especially in the design and fabrication of dynamic polymer nanocomposites (DPNs). In this contribution, we present facile methods for synthesizing flexible, healable, conductive, and recyclable thermoresponsive DPNs using three dynamic chemistries playing distinct roles. Dynamic hydrogen bonds account for material flexibility and recycling character. Thiol-Michael exchange accounts for thermoresponsive properties. Diels-Alder reaction leads to covalent bonding between polymer matrix and nanocomposite. Overall, the presence of multiple types of orthogonal dynamic bonds provided a solution to the trade-off between enhanced mechanical performance and material elongation in DPNs. Efficient reinforcement was achieved using < 1 wt % multiwalled carbon nanotubes as nanocomposite. Resulting DPNs showed excellent healability with over 3 MPa increase in stress compared to unreinforced materials. Due to multiple responsive dynamic linkages, > 90% stress-relaxation was observed with self-healing achieved within 1 h of healing time. Increased mechanical strength, electrical conductivity, and reprocessability were achieved all while maintaining material flexibility and extensibility, hence highlighting the strong promise of these DPNs in the rapidly growing fields of flexible compliant electrodes and strain sensors.