Mechanical properties of doubly crosslinked gels
Mechanical properties of doubly crosslinked gels
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DOI：
10.1038/s41428-019-0203-6
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发表时间：
2019-09
期刊：
影响因子：
2.8
通讯作者：
T. Katashima;U. Chung;T. Sakai
中科院分区：
文献类型：
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作者：
T. Katashima;U. Chung;T. Sakai
我们利用两个相互作用的四臂聚乙二醇AB型交联偶联形成的四聚乙二醇凝胶，在凝胶反应过程中拉伸凝胶，制备了具有内应力的双交联凝胶。在双交联凝胶中，具有不同参考态的两个网络共存并相互平衡，导致杨氏模量和残余应变增加。我们通过调节施加凝胶拉伸的时间和拉伸比率来研究这些性质。残余应变随拉伸时间和拉伸比的增加而增大。另一方面，对于凝胶的拉伸，杨氏模量在某一时刻有一个最大值，并且随着拉伸比的增加而增大。在经典双网络理论的框架下，第一网络和第二网络的应变能之间的平衡很好地解释了这些结果，其中总应变能被描述为第一网络和第二网络能量的简单和。
We fabricated the doubly crosslinked gel, with internal stress by stretching the gel during the gelation reaction using tetra-PEG gels, which are formed by the AB type crosslink-coupling of two mutually reactive tetra-arm polyethylene glycol (PEG). In a doubly crosslinked gel, two networks having different reference states coexist with and balance each other, resulting in enhanced Young’s modulus and residual strain. We investigated these properties by tuning the time for the imposition of the stretching of the gels and the stretching ratio. The residual strain increased with increase in the time for the imposition of stretching and the stretching ratio. On the other hand, the Young’s modulus had a maximum value at a certain time for the imposition of the stretching of the gels and increased with increasing stretching ratio. These results were well explained by the balance between the strain energies of the first and second networks under the framework of the classical two-network theory, where the total strain energy is described as a simple sum of the energies of the first and second networks.