Lamellar Bilayers as Reversible Sacrificial Bonds To Toughen Hydrogel: Hysteresis, Self-Recovery, Fatigue Resistance, and Crack Blunting
Lamellar Bilayers as Reversible Sacrificial Bonds To Toughen Hydrogel: Hysteresis, Self-Recovery, Fatigue Resistance, and Crack Blunting
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DOI：
10.1021/ma201653t
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发表时间：
2011-11-22
期刊：
影响因子：
5.5
通讯作者：
Gong, J. Ping
中科院分区：
文献类型：
--
作者：
Haque, M. Anamul;Kurokawa, Takayuki;Gong, J. Ping
我们报告了非凡的韧性，滞后，自我恢复，和持久的抗疲劳性的各向异性水凝胶与单域层状结构，包括在韧性，亲水性聚合物基质中的数千个刚性，疏水双层的周期性堆叠。分层的层状双层膜不仅吸收光，表现出壮丽的结构色彩，而且还作为可逆的牺牲键，在变形时解离，表现出大的滞后作为能量耗散机制。双层膜的分子解离和类脂质移动的性质通过抑制裂纹尖端的应力集中并形成异常的裂纹钝化而显著增强了对裂纹扩展的抵抗力。这一独特的增韧现象有助于深入了解水凝胶类软材料如生物软组织的增韧机理。
We report the extraordinary toughness, hysteresis, self-recovery, and persistent fatigue resistance of an anisotropic hydrogel with single-domain lamellar structure, consisting of periodical stacking of several thousands of rigid, hydrophobic bilayers in the ductile, hydrophilic polymer matrix. The stratified lamellar bilayers not only diffract light to exhibit magnificent structural color but also serve as reversible sacrificial bonds that dissociate upon deformation, exhibiting large hysteresis as an energy dissipation mechanism. Both the molecular dissociation and lipid-like mobile nature of bilayers dramatically enhance the resistance to crack propagation by suppressing the stress concentration at the crack tip with the formation of extraordinary crack blunting. This unique toughening phenomenon could allow deep insight into the toughening mechanism of the hydrogel-like soft materials such as biological soft tissues.