Abstract
Shear-stiffening polyborosiloxane (PBS), well-known as “silly putty”, “bouncing putty” or “solid-liquid”, has been widely used in protective armors, sport equipment, toys and so on, due to its fascinating anti-impact property. Since it was created during World War II, there has been rare upgrade of the material. Herein, we synthesize a novel shear-stiffening material, polydiborosiloxane (PDBS), through the design of diboron/oxygen coordination bond. It is revealed that the diboron/oxygen coordination bond possesses more coordination states and higher bond energy than the coordination bond between monoboron and oxygen atoms, leading to a shear-stiffening behavior with more solid-like property. Therefore, PDBS exhibits superior anti-impact property and safeguarding performance to PBS. This shear-stiffening material will open up a new horizon for next-generation intelligent armors, dampers and sensors.
摘要
剪切增稠型聚硼硅氧烷(PBS)通常以“silly putty”, “bouncing putty”或“solid-liquid”被熟知. 因其独特的抗冲击性能, PBS广泛应用于防护装甲、 运动器材、 玩具等领域. 然而, 自第二次世界大战PBS被发明后, PBS材料的更新升级较少. 本论文中, 我们通过设计联硼/氧配位键制备了一类新型剪切增稠材料——聚联硼硅氧烷(PDBS). 结果表明, 与单硼/氧配位键相比, 联硼/氧配位键具有更多的配位结构和更高的键能, 导致PDBS具有更类固体性的剪切增稠行为. 因此, PDBS具有比PBS更优异的抗冲击性能与防护功能, 为新一代智能装备、 阻尼器和传感器的开发提供了一类高性能防护材料.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (52203064 and 51873110), Sichuan Science and Technology Program (2022YFG0115 and 2021JDJQ0018), Sichuan Science and Technology Program-Natural Science Foundation of Sichuan Province (2022NSFSC1982), the Fundamental Research Funds for the Central Universities (2022SCU12011), and the State Key Laboratory of Polymer Materials Engineering.
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Author contributions Wu J and Wu Q conceived and supervised the project. Wu Q designed the experiments, carried out the experiments and wrote the paper. Peng Y, Xiong H, Hou Y, and Cai M assisted in the characterization. Wu J, Wang Y, and Zhao L discussed and revised the paper.
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Supplementary information Experimental details and supporting data are available in the online version of the paper.
Qi Wu is an assistant research fellow at the College of Polymer Science and Engineering, Sichuan University. He received a Bachelor’s degree from Zhejiang University in 2014, a Master’s degree from the University of Chinese Academy of Sciences in 2017, and a doctoral degree from Sichuan University in 2021. His research interests focus on the design and study of intelligent responsive polymers enabled by boron dynamic chemistry.
Jinrong Wu is a professor at the College of Polymer Science and Engineering, Sichuan University. He received a Bachelor’s degree and a Doctoral degree in 2003 and 2008, respectively, from the College of Polymer Science and Engineering, Sichuan University. He studied at Texas Tech University as a visiting student from 2007 to 2008 and at Harvard University as a visiting scholar from 2014 to 2016. His current research involves high-performance, functional, and self-healing elastomers and related theoretical problems of elastomer materials
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Wu, Q., Peng, Y., Xiong, H. et al. A novel shear-stiffening supramolecular material derived from diboron structure. Sci. China Mater. 66, 4489–4498 (2023). https://doi.org/10.1007/s40843-023-2581-x
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DOI: https://doi.org/10.1007/s40843-023-2581-x