New aspects of nonlinear elasticity of polymer gels and elastomers revealed by stretching experiments in various geometries
New aspects of nonlinear elasticity of polymer gels and elastomers revealed by stretching experiments in various geometries
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DOI：
10.1002/pi.5153
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发表时间：
2017-02
影响因子：
3.2
通讯作者：
K. Urayama
中科院分区：
文献类型：
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作者：
K. Urayama
本文重点介绍了最近通过单轴拉伸和双向拉伸等不同类型的应变实验揭示的一系列凝胶和弹性体的非线性弹性的新特征。特别强调了不同方向的应变的交叉效应的大小，这可以用不相等的双向拉伸来表征。所研究的材料包括(1)水含量为98%的显著膨胀的水凝胶，(2)具有几乎均匀的网络结构的四臂聚乙二醇凝胶(Tetra-PEG)，没有网络链的缠结偶联，(3)沿网络链具有可移动交联度的滑环凝胶，(4)低密度的聚合物固体泡沫。应变的交叉效应的大小反映了每种材料的网络结构和交联物的结构特征以及整体可压缩性。我们还总结了在不同类型拉伸下应变驱动的膨胀和随之而来的力降低现象的最新结果。在现有结果的基础上，提出了有待研究的剩余问题。©2016化学工业学会
This review focuses on the novel features of nonlinear elasticity for a range of gels and elastomers that were recently revealed through experiments using various types of strain such as uniaxial and biaxial stretching. Particular emphasis is placed on the magnitude of the cross-effect of strains in different directions which can be characterized by unequal biaxial stretching. The studied materials include (1) markedly swollen hydrogels with a water content of 98%, (2) tetra-arm poly(ethylene glycol) (Tetra-PEG) gels with nearly uniform network structures without entanglement couplings of network strands, (3) slide-ring gels with movable crosslinks along network strands and (4) elastomer foams with low densities of polymer solids. The magnitude of the cross-effect of strains reflects the structural features of networks and crosslinks as well as bulk compressibility for each material. We also summarize recent results on strain-driven swelling and the accompanying force reduction phenomena under various types of stretching. Remaining issues to be investigated are presented on the basis of existing results. © 2016 Society of Chemical Industry