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arXiv 2408.02523cond-mat.softcond-mat.mtrl-sci
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极限变形双网络凝胶具有正的能量弹性

Ultimately deformed double-network gels possess positive energetic elasticity

Chika Imaoka, Tatsunari Masumi, Jian Ping Gong, Tsutomu Indei, Tasuku Nakajima

AI总结:

针对橡胶状聚合物网络弹性来源问题,该研究通过热力学分析发现双网络凝胶在单轴极限变形下由熵弹性转变为内能驱动弹性,并建立考虑能量贡献的模型再现其应力-应变温度依赖。

摘要:

橡胶状聚合物网络的弹性一直被认为是由熵驱动的。另一方面,对单聚合物链力学的研究表明,极限拉伸聚合物链的弹性由主要源于化学键变形的能量贡献所主导。在此,我们通过热力学分析在实验上发现,随着双网络凝胶发生单轴变形,其弹性从熵主导转变为内能驱动。基于这一发现,我们开发了一个考虑能量贡献的简单力学模型,并发现该模型近似再现了双网络凝胶应力-应变曲线的温度依赖性。本研究证明了在高变形橡胶状聚合物网络的力学分析中化学视角的重要性。

英文摘要:

The elasticity of rubbery polymer networks has been considered to be entropy-driven. On the other hand, studies on single polymer chain mechanics have revealed that the elasticity of ultimately stretched polymer chains is dominated by the energetic contribution mainly originating from chemical bond deformation. Here, we experimentally found that the elasticity of the double-network gel transits from the entropy-dominated one to the internal energy-driven one with its uniaxial deformation through the thermodynamic analysis. Based on this finding, we developed a simple mechanical model that takes into account the energetic contribution and found that this model approximately reproduces the temperature dependence of the stress-strain curve of the double-network gel. This study demonstrates the importance of the chemical perspective in the mechanical analysis of highly deformed rubbery polymer networks.

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