Wu Mingyue, Wang Guohui, Zhang Mihan, Li Jinchao, Wang Chenglong, Sun Guangdong, Zheng Jinhuan
Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China.
The Institute of Sericulture and Tea, Zhejiang Academy of Agricultural Sciences, Hangzhou 310018, P. R. China.
Soft Matter. 2024 Aug 28;20(34):6800-6807. doi: 10.1039/d4sm00363b.
A flexible, tough, highly transparent and piezoelectric polyacrylamide hydrogel was fabricated induced by blue light photocuring, with camphorquinone/diphenyliodonium hexafluorophosphate (CQ/DPI) as the blue light initiator, acrylamide (AM) and ,-dimethylacrylamide (DMAA) as monomers, polyethylene glycol diacrylate (PEGDA) as the crosslinker, lecithin as the dispersant, and BaTiO as the piezoelectric material. Various performance tests were carried out on the hydrogel, and the results showed that lecithin enhances the dispersion of BaTiO within the system and improves the tensile properties (>100% strain) of the hydrogel, and the addition of PEGDA not only improves the photopolymerization performance of the hydrogel, but also significantly improves its fracture strength (∼0.3 MPa). In addition, BaTiO enables the resultant hydrogels to show excellent conductivity (>1.5) and stable response to strain. The assembled hydrogel sensor shows a sensitive response to human joint activities, which is expected to be applied in self-powered sensors and energy collection.
通过蓝光光固化制备了一种柔性、坚韧、高度透明且具有压电性的聚丙烯酰胺水凝胶，以樟脑醌/六氟磷酸二苯基碘鎓（CQ/DPI）作为蓝光引发剂，丙烯酰胺（AM）和N,N'-二甲基丙烯酰胺（DMAA）作为单体，聚乙二醇二丙烯酸酯（PEGDA）作为交联剂，卵磷脂作为分散剂，钛酸钡（BaTiO）作为压电材料。对该水凝胶进行了各种性能测试，结果表明卵磷脂增强了BaTiO在体系内的分散性，并改善了水凝胶的拉伸性能（应变>100%），PEGDA的加入不仅提高了水凝胶的光聚合性能，还显著提高了其断裂强度（约0.3MPa）。此外，BaTiO使所得水凝胶表现出优异的导电性（>1.5）和对应变的稳定响应。组装的水凝胶传感器对人体关节活动表现出灵敏响应，有望应用于自供电传感器和能量收集。
