Shardakov Igor N, Trufanov Aleksandr N
Institute of Continuous Media Mechanics, Ural Branch of Russian Academy of Sciences, 614013 Perm, Russia.
Department of Computational Mathematics, Mechanics and Biomechanics, Perm National Research Polytechnic University, 614990 Perm, Russia.
Polymers (Basel). 2021 Sep 8;13(18):3035. doi: 10.3390/polym13183035.
In this paper, we proposed an approach to study the strain response of polymer film samples under various temperature effects and note their corresponding effects. The advantages of the developed approach are determined by the fact that thin films of material are used as samples where it is possible to generate a sufficiently uniform temperature field in a wide range of temperature change rates. A dynamic mechanical analyzer was used for the experimental implementation of the above approach for two UV-curable polymers and one type of epoxy resin. Experimental results have shown that the thermal expansion coefficients for these polymers depend significantly not only on the temperature but also on its change rate. The strain response of the polymer to heating and cooling, with the same absolute values of the rate of temperature change, differs significantly, and this dissimilarity becomes stronger with its increasing. The results of thermomechanical experiments for massive samples on traditional dilatometer are shown to compare with the results for film samples. The discovered dependences of the temperature expansion coefficient on the temperature and its change rate can be used for mathematical modeling of thermomechanical processes arising during the operation of products made of polymers.
在本文中，我们提出了一种方法来研究聚合物薄膜样品在各种温度效应下的应变响应，并记录其相应的效应。所开发方法的优点在于使用材料薄膜作为样品，在很宽的温度变化率范围内能够产生足够均匀的温度场。使用动态力学分析仪对两种紫外光固化聚合物和一种环氧树脂实施上述方法进行实验。实验结果表明，这些聚合物的热膨胀系数不仅显著取决于温度，还取决于其变化率。在温度变化率绝对值相同的情况下，聚合物在加热和冷却时的应变响应差异显著，并且随着温度变化率的增加，这种差异变得更加明显。展示了在传统膨胀仪上对块状样品进行热机械实验的结果，以便与薄膜样品的结果进行比较。所发现的热膨胀系数对温度及其变化率的依赖性可用于对聚合物制成的产品在运行过程中产生的热机械过程进行数学建模。
