Storage and loss moduli behavior of plasticized epoxy polymers over a frequency and temperature range, and damaging effects assessment by means of the NDT method of ultrasounds and moisture absorption
Storage and loss moduli behavior of plasticized epoxy polymers over a frequency and temperature range, and damaging effects assessment by means of the NDT method of ultrasounds and moisture absorption
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塑化环氧聚合物在一定频率和温度范围内的储能和损耗模量行为，以及通过超声波和吸湿无损检测方法评估破坏效应
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
V. Kytopoulos
中科院分区：
文献类型：
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作者：
E. Sideridis;I. Prassianakis;V. Kytopoulos
本实验工作的第一个目标是评估增塑环氧聚合物在温度和频率范围内的储能模量和损耗模量，并与超声波表征此类聚合物的能力相关。使用的材料是一系列冷固化环氧聚合物，用不同量的增塑剂增塑。在通过振动试验对动态特性进行研究之后，计算出纵向和横向弹性波的速度和声衰减系数a，然后使用这些量计算出“动态”模量E′、G′和ν′。此后，可以说，增塑剂含量和测量频率范围强烈影响材料的弹性模量，因为增塑剂倾向于降低，而测量频率增加这些。这项工作的第二个目标是评估和讨论相关联的增塑剂引起的微观结构破坏的影响，通过组合的方法，超声波，拉伸模量，以及吸湿性测试，然后将此评估与储能模量的行为。结果表明，尽管实验数据中存在不可忽视的分散性，但某些不可抗拒的总趋势是可以评估的。在这种情况下，有人发现，损伤的“响应”是显着敏感的各自应用的“检测”技术，因此，这些不同的技术获得的损伤演变数据是可比的，只有在某些情况下。通过应用技术之间的比较，似乎可以合理地假设，由于其固有的微观质量传输过程中，在H2O分子扩散的形式，因此它的能力，“检测”微观结构检测在一个低得多的规模，“水分”技术，应该给一个更好的办法，内部损伤现象。© 2006 Wiley Periodicals，Inc.应用聚合物科学杂志101：3869-3880，2006
The first objective of the present experimental work is to evaluate the storage and loss moduli of plasticized epoxy polymers over a temperature and frequency range, and to correlate with the ability of the ultrasounds for the characterization of such polymers. The materials used were a series of cold-setting epoxy polymers, plasticized with different amounts of plasticizer. After the investigation of dynamic properties through vibration tests, the velocities of longitudinal and transverse elastic waves, and the acoustic attenuation coefficient a were evaluated and, then, using these quantities, the “dynamic” moduli E′, G′, and ν′ were evaluated. Thereafter, it can be stated that the plasticizer content and measuring frequency range strongly influence the elastic moduli of the material in the sense that the plasticizer tends to reduce, whereas the measuring frequency to increase these. The second objective of this work is to asses and discuss the associated plasticizer-induced microstructural damaging effects by combined methods of ultrasounds, tensile modulus, as well as moisture absorption testing and then to correlate this assessment with the storage moduli behavior. It was shown that, despite the nonneglecting scatter in the experimental data, certain irresistible general trends might be assessed. In this context, it was found that the damage “response” is markedly sensitive to the respective applied “detection” technique and, therefore, the damage evolution data obtained by these different techniques are comparable only under certain circumstances. By comparison between the applied techniques, it seems reasonable to assume that the “moisture” technique due to its inherent microscopic mass transport processes, in the form of H2O molecules diffusion and therefore its ability to “detect” microstructural detects on a much lower scale, should give a better approach to the internal damage phenomena. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3869–3880, 2006