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首页> 外文会议>TECH Global Conference; 20040512-14; Orlando,FL(US) >APPLICATION OF A NOVEL IMPEDANCE SENSOR FOR MEASURING BVTERFACIAL DIFFUSION AND ADHESION LOSS OF PRESSURE SENSITIVE ADHESIVES IN AGGRESSIVE ENVIRONMENTS
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APPLICATION OF A NOVEL IMPEDANCE SENSOR FOR MEASURING BVTERFACIAL DIFFUSION AND ADHESION LOSS OF PRESSURE SENSITIVE ADHESIVES IN AGGRESSIVE ENVIRONMENTS

机译：新型阻抗传感器在粘性环境中细菌扩散和粘附损失的测量中的应用

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The lifetime of an adhesive joint can be significantly reduced by environmental stresses such as temperature, moisture, and/or other aggressive fluids. Therefore, it is of great interest to know the concentration of such fluids in the bulk adhesive and at the interface of the adhesive joint. Changes in the concentration of absorbed fluid with exposure time were correlated to the measured capacitance and resistance utilizing interfacial impedance spectroscopy (IIS) and a novel interdigitated electrode sensor. The IIS sensors measure the impedance of mapped areas of the sensor defined with respect to the sensor edge. This is accomplished using a series of independent conductive gold traces arranged parallel to the sensor edge. The adhesive is applied to the surface of the IIS sensor and is then exposed to the aggressive environment. The sensor indicates changes in concentration of fluid as a function of distance from edge of the sensor. This provides a capability to measure bulk and interfacial rates of diffusion and to detect regions of adhesive debonding. In this work an aluminum foil backing pressure sensitive adhesive tape was exposed to acetone at room temperature. Because the backing is impermeable, diffusion was confined to one dimension, parallel to the surface. The change in the relative concentration of acetone verses exposure time is resolved spatially with respect to the exposed edge, and the results were correlated with the 90° peel test experiments.
机译：粘合接头的使用寿命会因环境应力（例如温度，湿度和/或其他腐蚀性流体）而大大缩短。因此，非常有趣的是要知道这种流体在本体粘合剂中和粘合剂接头的界面处的浓度。吸收液体浓度随暴露时间的变化与利用界面阻抗谱（IIS）和新型叉指电极传感器测得的电容和电阻相关。 IIS传感器测量相对于传感器边缘定义的传感器映射区域的阻抗。这是通过使用一系列平行于传感器边缘布置的独立导电金迹线来实现的。将该胶粘剂施加到IIS传感器的表面，然后暴露在侵蚀性环境中。传感器指示流体浓度的变化，该变化是距传感器边缘的距离的函数。这提供了测量体积和界面扩散速率以及检测粘合剂剥离区域的能力。在这项工作中，铝箔背压敏胶带在室温下暴露于丙酮。由于背衬是不可渗透的，因此扩散仅限于平行于表面的一维。丙酮相对浓度相对于暴露时间的变化相对于暴露的边缘在空间上得到解决，并且结果与90°剥离测试实验相关。

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