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首页> 外文期刊>Journal of Applied Polymer Science >Water absorption mechanism and some anomalous effects on the mechanical and viscoelastic behavior of an epoxy system
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Water absorption mechanism and some anomalous effects on the mechanical and viscoelastic behavior of an epoxy system

机译：吸水机理以及对环氧体系机械和粘弹性行为的一些反常影响

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摘要

During the past decades there has been a great accumulation of important data on the diffusion of water molecules in polymeric solids and its effect on the mechanical and viscoelastic behavior of polymers. It has become apparent that in many cases diffusion in polymers as well as its effect exhibits features that cannot be expected from classical theories and that such departures are related to the molecular structure characteristics of polymers. In the present investigation, the mechanical and viscoelastic behavior of an epoxy resin system is studied as a function of absorbed water, temperature, and time of immersion. Water sorption was achieved by immersing the material in distilled water at constant temperature of 60 degrees C and 80 degrees C for 2, 5, 8, 13, 32, 74, 128, 266, 512, 1024, and 1536 h. Subsequently the specimens were tested in static and dynamic three-point bending tests to study their mechanical and viscoelastic behavior. The variation of T-g, tan delta, bending modulus, and Iiunction of exposure time and strength was measured as a, respective percentage of water uptake for both temperatures. Some anomalies in their behavior due to water absorption were observed, and a model for the description of the experimentally observed mechanical behavior due to hygrothermal aging is proposed. The results show that the model predictions are in good agreement with experimental findings. (c) 2005 Wiley Periodicals, Inc.
机译：在过去的几十年中，已经有大量有关聚合物中水分子扩散及其对聚合物的机械和粘弹性行为的影响的重要数据的积累。显而易见的是，在许多情况下，聚合物中的扩散及其作用表现出经典理论无法预期的特征，并且这种偏离与聚合物的分子结构特征有关。在本研究中，研究了环氧树脂体系的机械和粘弹性行为，它是吸收水，温度和浸入时间的函数。通过将材料浸入60摄氏度和80摄氏度的恒定温度的蒸馏水中2、5、8、13、32、74、128、266、512、1024和1536 h，实现吸水。随后，样品在静态和动态三点弯曲测试中进行测试，以研究其力学性能和粘弹性行为。测量T-g，tanδ，弯曲模量以及暴露时间和强度的变化，以两种温度下的吸水百分比表示。观察到由于吸水而引起的一些行为异常，并提出了一个模型来描述由于湿热老化而在实验上观察到的力学行为。结果表明，模型预测与实验结果吻合良好。 （c）2005年Wiley Periodicals，Inc.

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