Selective Laser Sintering of Polydimethylsiloxane Composites.

IF 2.3 4区工程技术 Q3 ENGINEERING, MANUFACTURING 3D Printing and Additive Manufacturing Pub Date : 2023-08-01 Epub Date: 2023-08-09 DOI:10.1089/3dp.2021.0105

Jinzhi Wang, Shaojie Sun, Xue Li, Guoxia Fei, Zhanhua Wang, Hesheng Xia

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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.

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选择性激光烧结聚二甲基硅氧烷复合材料。

导电硅弹性体碳纳米管（CNTs）复合材料在电子皮肤、可穿戴电子设备和人体运动检测等多个领域都具有潜在的应用价值。基于自制的含有动态立体阻碍吡唑脲键的聚二甲基硅氧烷（PDMS）共价适应性网络（CANs）（PDMS-CANs），通过液相吸附沉积制备了包裹 PDMS-CANs 的 CNTs（CNTs@PDMS-CANs）粉末，并成功用于选择性激光烧结（SLS）三维打印。SLS 印刷的 PDMS-CANs/CNTs 纳米复合材料具有高导电性和低渗流阈值的特点，因为 SLS 是一种准静态加工工艺，利用具有特殊 CNTs 包裹结构的 PDMS 粉末形成了导电离析 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愈能力。此外，由于受损区域和完好区域存在电阻差异，因此可在通电情况下通过红外热成像仪进行裂缝诊断。在应变传感器的应用演示中，该复合材料在循环压缩和弯曲时表现出有规律的循环电阻变化，表明其可靠性相对较高。

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来源期刊

3D Printing and Additive Manufacturing Materials Science-Materials Science (miscellaneous)

CiteScore

6.00

自引率

6.50%

发文量

126

期刊介绍： 3D Printing and Additive Manufacturing is a peer-reviewed journal that provides a forum for world-class research in additive manufacturing and related technologies. The Journal explores emerging challenges and opportunities ranging from new developments of processes and materials, to new simulation and design tools, and informative applications and case studies. Novel applications in new areas, such as medicine, education, bio-printing, food printing, art and architecture, are also encouraged. The Journal addresses the important questions surrounding this powerful and growing field, including issues in policy and law, intellectual property, data standards, safety and liability, environmental impact, social, economic, and humanitarian implications, and emerging business models at the industrial and consumer scales.