On the Representation of Ageing Phenomena
On the Representation of Ageing Phenomena
复制标题
论衰老现象的表征
DOI：
10.1080/00218464.2012.682905
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
M. Johlitz
中科院分区：
文献类型：
--
作者：
M. Johlitz
聚合物在工业发展中变得极其重要。如今，它们被用于汽车制造、造船、土木工程以及轮胎生产中的减振轴承，但不仅限于这些。它们良好的可成型性、可加工性、柔韧性和粘合性也长期以来被用作涂层材料，例如用于太阳能光伏电池、金属表面、电子元件，现在甚至用于医疗植入物的生物相容性涂层。因此，聚合物涂层的目的是保护下面的材料免受环境影响和潜在破坏性介质的影响。然而，确保充分的保护需要了解聚合物材料的有效寿命和老化行为，这使我们想到了本贡献的主题。将讨论各种老化现象，并介绍实验方法，提供有关聚合物物理老化行为及其化学老化行为部分区域的信息。将从已获得的实验结果中导出受流变驱动且热机械一致的唯象材料模型。该模型不仅能够描述物理老化过程，而且还允许将热氧化老化描述为可能的化学老化行为的代表。一维模型的制定使其能够检测玻璃化转变区域，这对于物理老化行为至关重要。它考虑了化学引起的断链和网络重组的老化现象，而不需要详细解析微观过程。
Polymers have become immensely important in industrial development. They are nowadays used for vibration damping bearings in car manufacturing, shipbuilding, and civil engineering and in the production of tyres, but not only for these. Their good formability, processibility, flexibility, and adhesiveness have also long resulted in their application as coating materials, for example for solar voltaic cells, metal surfaces, electronic components, and now even for biocompatible coating of medical implants. The purpose of the polymeric coating is thereby to protect the underlying material against environmental influences and potentially damaging media. The ensurement of adequate protection requires a knowledge of the effective life and ageing behaviour of the polymeric material, however, which brings us to the subject of this contribution. Various ageing phenomena will be discussed and experimental methods will be presented which provide information on both the physical ageing behaviour of polymers as well as on a partial area of their chemical ageing behaviour. A phenomenological material model which is rheologically motivated and thermo-mechanically consistent will be derived from the experimental results which have been obtained. The model not only enables physical ageing processes to be described, but also allows thermo-oxidative ageing to be depicted as representative of a possible chemical ageing behaviour. The formulation of the one-dimensional model enables it to detect the glass transition region, which is an essential for physical ageing behaviour. It takes the chemically caused ageing phenomena of chain scission and network reformation into consideration without the need to resolve microscopic processes in detail.
聚氨酯粘结剂的尺寸效应：实验、建模和参数识别
影响因子：
4.5
作者：
M. Johlitz;S. Diebels;J. Batal;H. Steeb;W. Possart
通讯作者：
W. Possart