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Evidence of Deformation-Dependent Heat Capacity and Energetic Elasticity in a Cross-Linked Elastomer Subjected to Uniaxial Elongation
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1021/acs.macromol.7b02139 David Nieto Simavilla 1 , Jay D. Schieber 1 , David C. Venerus 1
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1021/acs.macromol.7b02139 David Nieto Simavilla 1 , Jay D. Schieber 1 , David C. Venerus 1
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We present a novel infrared thermography technique to investigate the dependence of heat capacity on deformation in cross-linked polymers. This phenomenon is directly related with the longstanding question of whether or not there is an energetic contribution to the stress in deformed polymers and, in general, to the nonisothermal, viscoelastic behavior of polymer materials. By tracking the temperature evolution of samples heated by a laser, we are able to measure heat capacity changes relative to the equilibrium value in an elastomer subjected to uniaxial extension. We find that the heat capacity increases with elongation in lightly cross-linked cis-1,4-polyisoprene. Remarkably, the onset of heat capacity dependence on deformation is observed at strains similar to those required to achieve finite extensibility. The deviation from the equilibrium value of heat capacity is consistent with an independent set of experiments comparing anisotropy in thermal diffusivity from forced Rayleigh scattering and thermal conductivity from steady-state infrared thermography. Finally, we propose a straightforward thermodynamic analysis of the results based on classical rubber elasticity.
中文翻译：
单轴伸长下交联弹性体中变形依赖的热容和能量弹性的证据
我们提出了一种新颖的红外热成像技术，以研究热容量对交联聚合物中变形的依赖性。这种现象与长期存在的问题直接相关，即是否对变形的聚合物中的应力产生能量贡献，并且通常与聚合物材料的非等温，粘弹性行为有关。通过跟踪由激光加热的样品的温度变化，我们能够测量热容量相对于单轴拉伸弹性体中平衡值的变化。我们发现，在轻度交联的顺式中，热容随着伸长而增加-1,4-聚异戊二烯。值得注意的是，在类似于实现有限扩展性所需的应变的应变下，观察到了热容量对变形的依赖性。与热容量平衡值的偏差与一组独立的实验一致，该实验比较了强制瑞利散射的热扩散率各向异性和稳态红外热成像的热导率。最后，我们提出了基于经典橡胶弹性的结果的直接热力学分析。
更新日期：2018-01-02
中文翻译：
单轴伸长下交联弹性体中变形依赖的热容和能量弹性的证据
我们提出了一种新颖的红外热成像技术，以研究热容量对交联聚合物中变形的依赖性。这种现象与长期存在的问题直接相关，即是否对变形的聚合物中的应力产生能量贡献，并且通常与聚合物材料的非等温，粘弹性行为有关。通过跟踪由激光加热的样品的温度变化，我们能够测量热容量相对于单轴拉伸弹性体中平衡值的变化。我们发现，在轻度交联的顺式中，热容随着伸长而增加-1,4-聚异戊二烯。值得注意的是，在类似于实现有限扩展性所需的应变的应变下，观察到了热容量对变形的依赖性。与热容量平衡值的偏差与一组独立的实验一致，该实验比较了强制瑞利散射的热扩散率各向异性和稳态红外热成像的热导率。最后，我们提出了基于经典橡胶弹性的结果的直接热力学分析。
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