Silicone polymers have enormous applications, especially in the areas of biomedical engineering. Ecoflex, a commercially available room temperature cured silicone polymer, has attracted considerable attention due to its wide range of applications as medical-grade silicones and as matrix materials in producing nano-filled stretchable sensors and dielectric elastomers for soft robotics. In this contribution, we have conducted a wide range of experiments under thermo-mechanical loadings. These experiments consist of loading-unloading cyclic tests, single-step relaxation tests, Mullins effects tests at different strain rates and stretches, stress recovery tests at different rest time etc. In order to assess the temperature influences on Ecoflex, a number of viscoelastic tests are performed in a thermal chamber with temperature ranging from-40 • C to 140 • C. Extensive experimental findings illustrate that Ecoflex experiences a significant stress softening in the first cycles and such a softening recovers gradually with respect to time. It also shows a significant amount of cyclic dissipation at various stretch levels as well as a considerable stress relaxation only for virgin samples. Cyclic dissipations and stress relaxation almost disappear for the case of pre-stretched samples. Furthermore, the material is more or less sensitive under a wide range of temperature differences.

中文翻译：

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Ecoflex 聚合物的综合热粘弹性实验研究

有机硅聚合物具有广泛的应用，特别是在生物医学工程领域。Ecoflex 是一种市售的室温固化有机硅聚合物，因其作为医疗级有机硅的广泛应用以及在生产纳米填充可拉伸传感器和用于软机器人的介电弹性体中作为基质材料而受到广泛关注。在这个贡献中，我们在热机械载荷下进行了广泛的实验。这些实验包括加载-卸载循环测试、单步松弛测试、不同应变率和拉伸下的穆林斯效应测试、不同休息时间下的应力恢复测试等。 为了评估温度对 Ecoflex 的影响，在温度范围从 40 • C 到 140 • C 的热室中进行了许多粘弹性测试。大量实验结果表明，Ecoflex 在第一个循环中经历了显着的应力软化，并且这种软化随着时间的推移逐渐恢复。它还显示出在不同拉伸水平下的大量循环耗散以及仅对原始样品的相当大的应力松弛。对于预拉伸样品，循环耗散和应力松弛几乎消失。此外，该材料在很宽的温差范围内或多或少地敏感。它还显示出在不同拉伸水平下的大量循环耗散以及仅对原始样品的相当大的应力松弛。对于预拉伸样品，循环耗散和应力松弛几乎消失。此外，该材料在很宽的温差范围内或多或少地敏感。它还显示出在不同拉伸水平下的大量循环耗散以及仅对原始样品的相当大的应力松弛。对于预拉伸样品，循环耗散和应力松弛几乎消失。此外，该材料在很宽的温差范围内或多或少地敏感。