【翔龙鸣凤科学论坛】Toughening soft materials with sacrificial bonds

活动名称：

翔龙鸣凤科学论坛讲座系列：Toughening soft materials with sacrificial bonds

活动时间：

2022年9月14日（周三）15:00

报告嘉宾：

Prof. Jian Ping Gong (Hokkaido University)

主办单位：

香港中文大学（深圳）理工学院

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报告人介绍

Prof. Jian Ping Gong

Hokkaido University

Jian Ping Gong is a distinguished professor of Hokkaido University, Japan. She graduated from Zhejiang University, China, and received Doctor of Engineering at Tokyo Institute of Technology. She joined the faculty at Hokkaido University in 1993. She has been focusing on novel functions of hydrogels, including tough double network hydrogels, self-healing hydrogels, hydrogel friction and adhesion, hydrogel composites. Recently, she is focusing on functional hydrogels inspired by biological systems, including self-growing hydrogels, thermal stiffening hydrogels, marine adhesive hydrogels, and memorizing-forgetting hydrogels. She is also working on the applications of the double network hydrogels as cartilages. She received several awards including Wiley Polymer Science Award (2001), The Award of the Society of Polymer Science, Japan (2006), The Chemical Society of Japan Award (2011), The DSM Materials Sciences Award (2014), the MEXT Commendation for Science and Technology, Japan (2019), the Chemical Society of Japan (CSJ) Award (2021). 

报告简介

Invention of the double network (DN) hydrogel in 2003 significantly modified the knowledge that hydrogels are weak materials. The extra-ordinary toughness of DN gels is a consequence of the internal fracture of the brittle network to dissipate significant amounts of energy under large deformation and the elasticity of the second network to maintain their original configurations after the deformation. Thus, the covalent bond of the brittle first network serves as true “sacrificial bond”, for the toughness of the DN gels [1,2].   

The double network concept naturally suggests a more general strategy for designing tough soft materials: incorporating, on purpose, a mechanically fragile structure or weak bonds toughens the materials as whole. This strategy gives more freedom in the molecular design, not limited to double or multiple network systems but also applies to single network system if it has sacrificial bonds to dissipate energy and can retain original configurations of the material after large deformation. This strategy has been proved effective using non-covalent bonds such as ionic bonds in hydrogels [3]. One further goal is to develop tough soft materials with anisotropic mechanical performance resembling to skins, cartilages, muscle, and tendons. This possibility is demonstrated by a fully anisotropic hydrogels consisting of layered lipid membranes entrapped in the matrix of neutral network. The integrations and interactions of different mechanisms for dissipating energy and maintaining elasticity are essential to the design of tough soft materials, including hydrogels and elastomers.

Living tissues, such as muscle, autonomously grow and remodel themselves to adapt to their surrounding mechanical environment through metabolic processes. By contrast, typical synthetic materials cannot grow and reconstruct their structures once formed. Finally, we present a strategy for developing “self-growing” polymeric materials that respond to repetitive mechanical stress through an effective mechanochemical transduction in the robust double network hydrogels [4].

1. J. P. Gong, Y. Katsuyama, T. Kurokawa, Y. Osada, "Double Network Hydrogels with Extremely High Mechanical Strength", Advanced Materials, 15(14), 1155-1158(2003).

2. Jian Ping Gong, "Why are double network hydrogels so tough?", Soft Matter, 6(12), 2583-2590(2010).

3. Tao Lin Sun, Takayuki Kurokawa, Shinya Kuroda, Abu Bin Ihsan, Taigo Akasaki, Koshiro Sato, Md. Anamul Haque, Tasuku Nakajima, Jian Ping Gong, "Physical hydrogels composed of polyampholytes demonstrate high toughness and viscoelasticity", Nature Materials, 12(10), 932-937(2013).

4. Takahiro Matsuda, Runa Kawakami, Ryo Namba, Tasuku Nakajima, Jian Ping Gong, "Mechanoresponsive Self-growing Hydrogels Inspired by Muscle Training", Science, 363(6426), 504-508 (2019).

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