PDF(Pubmed)
Abstract：
Conductive silicone elastomer carbon nanotubes (CNTs) composites possess potential applications in a variety of fields, including electronic skin, wearable electronics, and human motion detection. Based on a novel self-made covalent adaptable network (CANs) of polydimethylsiloxane (PDMS) containg dynamic steric-hindrance pyrazole urea bond (PDMS-CANs), CNTs wrapped PDMS-CANs (CNTs@PDMS-CANs) powders were prepared by a liquid phase adsorption and deposition, and were successfully used for selective laser sintering (SLS) three-dimensional printing. SLS-printed PDMS-CANs/CNTs nanocomposites possess high electrical conductivity and low percolation threshold as SLS is one kind of quasi-static processing, which leads to the formation of conductive segregated CNTs network by using the PDMS powders with special CNTs wrapped structure. The introduction of dynamic pyrazole urea bond endows the materials self-healing capability under electrothermal and photothermal stimulus. In addition, due to the resistance difference of the damaged and intact areas, crack diagnosing can be realized by infrared thermograph under electricity. In an application demonstration in strain sensor, the composite exhibits a regular cyclic electrical resistance change at cyclic compression and bending, indicating a relative high reliability.
摘要：
导电有机硅弹性体碳纳米管(CNTs)复合材料在各个领域具有潜在的应用,包括电子皮肤，可穿戴电子产品，和人体运动检测。基于聚二甲基硅氧烷（PDMS）的新型自制共价自适应网络（CAN），该网络包含动态空间位阻吡唑脲键（PDMS-CAN），采用液相吸附沉积法制备了CNTs包裹的PDMS-CANs(CNTs@PDMS-CANs)粉体,并成功用于选择性激光烧结(SLS)三维打印。SLS打印的PDMS-CANs/CNTs纳米复合材料具有较高的导电性和较低的渗滤阈值,通过使用具有特殊CNTs包裹结构的PDMS粉末，可以形成导电隔离的CNTs网络。动态吡唑脲键的引入赋予了材料在电热和光热刺激下的自修复能力。此外,由于受损和完好区域的电阻差异，裂纹诊断可以通过电力下的红外热成像来实现。在应变传感器的应用演示中，复合材料在循环压缩和弯曲时表现出规则的循环电阻变化，表明相对较高的可靠性。
