Sun Manxi, Qiu Jianhui, Lu Chunyin, Jin Shuping, Zhang Guohong, Sakai Eiichi
Department of Mechanical Engineering, Faculty of Systems Science and Technology, Akita Prefectural University, Akita 015-0055, Japan.
College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China.
Polymers (Basel). 2020 Oct 1;12(10):2263. doi: 10.3390/polym12102263.
The engineering applications of hydrogels are generally limited by the common problem of their softness and brittlness. In this study, a composite double network ionic hydrogel (CDN-gel) was obtained by the facile visible light triggered polymerization of acrylic acid (AA), polyvinyl alcohol (PVA), and hydrolyzed triethoxyvinylsilane (TEVS) and subsequent salt impregnation. The resulting CDN-gels exhibited high toughness, recovery ability, and notch-insensitivity. The tensile strength, fracture elongation, Young's modulus, and toughness of the CDN-gels reached up to ~21 MPa, ~700%, ~3.5 MPa, and ~48 M/m, respectively. The residual strain at a strain of 200% was only ~25% after stretch-release of 1000 cycles. These properties will enable greater application of these hydrogel materials, especially for the fatigue resistance of tough hydrogels, as well as broaden their applications in damping.
水凝胶的工程应用通常受到其柔软性和脆性这一常见问题的限制。在本研究中，通过丙烯酸（AA）、聚乙烯醇（PVA）和水解三乙氧基乙烯基硅烷（TEVS）的简便可见光引发聚合以及随后的盐浸渍，获得了一种复合双网络离子水凝胶（CDN-凝胶）。所得的CDN-凝胶表现出高韧性、恢复能力和缺口不敏感性。CDN-凝胶的拉伸强度、断裂伸长率、杨氏模量和韧性分别达到约21 MPa、约700%、约3.5 MPa和约48 M/m。在1000次拉伸-释放循环后，200%应变下的残余应变仅约为25%。这些特性将使这些水凝胶材料得到更广泛的应用，特别是对于坚韧水凝胶的抗疲劳性，以及拓宽它们在阻尼方面的应用。
