Peng Shuqiang, Li Yuewei, Wu Lixin, Zhong Jie, Weng Zixiang, Zheng Longhui, Yang Zhi, Miao Jia-Tao
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou 350002 , People's Republic of China.
University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China.
ACS Appl Mater Interfaces. 2020 Feb 5;12(5):6479-6488. doi: 10.1021/acsami.9b20631. Epub 2020 Jan 23.
Advanced stretchable electronic sensors with a complex structure place higher requirements on the mechanical properties and manufacturing process of the stretchable substrate materials. Herein, three kinds of polyurethane acrylate oligomers were synthesized successfully and mixed with a commercial acrylate monomer (isobornyl acrylate) to prepare photocurable resins with a low viscosity for a digital light processing three-dimensional (3D) printer without custom equipment. Results showed that the resin containing poly(tetrahydrofuran) units (PPTMGA-40) exhibited optimal mechanical properties and shape recoverability. The tensile strength and elongation at break of PPTMGA-40 were 15.7 MPa and 414.3%, respectively. The unprecedented fatigue resistance of PPTMGA-40 allowed it to withstand 100 compression cycles at 80% strain without fracture. The transmittance of PPTMGA-40 reached 89.4% at 550 nm, showing high transparency. An ionic hydrogel was coated on the surface of 3D-printed structures to fabricate stretchable sensors, and their conductivity, transparency, and mechanical performance were characterized. A robust piezoresistive strain sensor with a high strength (∼6 MPa) and a wearable finger guard sensor were fabricated, demonstrating that this hydrogel-elastomer system can meet the requirements of applications for advanced stretchable electronic sensors and expand the usage scope.
具有复杂结构的先进可拉伸电子传感器对可拉伸基底材料的机械性能和制造工艺提出了更高的要求。在此，成功合成了三种聚氨酯丙烯酸酯低聚物，并与一种市售丙烯酸酯单体（异冰片基丙烯酸酯）混合，以制备用于数字光处理三维（3D）打印机的低粘度光固化树脂，无需定制设备。结果表明，含有聚四氢呋喃单元的树脂（PPTMGA - 40）表现出最佳的机械性能和形状恢复性。PPTMGA - 40的拉伸强度和断裂伸长率分别为15.7 MPa和414.3%。PPTMGA - 40前所未有的抗疲劳性使其能够在80%应变下承受100次压缩循环而不破裂。PPTMGA - 40在550 nm处的透光率达到89.4%，显示出高透明度。在3D打印结构的表面涂覆离子水凝胶以制造可拉伸传感器，并对其导电性、透明度和机械性能进行了表征。制备了一种具有高强度（约6 MPa）的坚固压阻应变传感器和一种可穿戴手指防护传感器，证明这种水凝胶 - 弹性体系统能够满足先进可拉伸电子传感器的应用要求，并扩大了使用范围。
