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首页> 外文会议>Pressure Sensitive Tape Council TECH; 20080507-09; Baltimore,MD(US) >Rheological Properties and Adherence Performance of PSAs: Adhesion on a Viscoelastic Substrate, Such as Human Skin
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Rheological Properties and Adherence Performance of PSAs: Adhesion on a Viscoelastic Substrate, Such as Human Skin

机译：PSA的流变特性和粘附性能：在粘弹性基材（例如人体皮肤）上的粘附

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In order to understand the adhesion mechanisms of pressure sensitive adhesives on viscoelastic substrates, we have studied model formulations derived from medical adhesive applications. We have identified the adhesion mechanisms (type of failure) and derived the contribution of each element of the system (adhesive, substrate) during a peel test. We have shown that the adhesion behavior of a PSA is not the same on a rigid or soft substrate. We have proposed a "transition failure diagram" which indicates that, when there is a competition between the elastic moduli of the adhesive and the substrate, there is no interfacial failure and the failure shifts directly to the stick-slip domain, which is not wanted for practical applications. This diagram indicates that the elastic modulus of the adhesive must be higher than the modulus of the substrate if one wishes to control the detachment of the adhesive. We have also proposed a relevant experimental device to measure the rheological properties under wet conditions, where it is possible to measure the rheological behavior of the adhesive after absorption of liquids. In a wet environment, it is possible to follow the modulus decrease down to the point where the modulus of the adhesive becomes of the same order of magnitude of the viscoelastic substrate (i.e. skin): at this point, the failure is unstable and some adhesive will remain on the patient skin in practical applications. These features may also be translated as a "critical wearing time" for the patient.
机译：为了了解压敏胶粘剂在粘弹性基材上的粘附机理，我们研究了源自医用胶粘剂应用的模型配方。我们已经确定了粘附机理（失效类型），并在剥离测试中得出了系统中每个元素（粘合剂，基材）的作用。我们已经表明，PSA在刚性或软质基材上的粘附行为是不同的。我们提出了一个“过渡破坏图”，该图表明，当粘合剂和基材的弹性模量之间存在竞争时，就没有界面破坏，并且破坏会直接转移到粘滑区域，这是不希望的。用于实际应用。该图表明，如果希望控制粘合剂的剥离，则粘合剂的弹性模量必须高于基材的模量。我们还提出了一种用于在潮湿条件下测量流变性能的相关实验装置，在该条件下可以测量吸收液体后粘合剂的流变行为。在潮湿的环境中，可能会导致模量下降，直到粘合剂的模量与粘弹性基材（即皮肤）的数量级相同：此时，破坏是不稳定的，有些粘合剂在实际应用中会残留在患者的皮肤上。这些特征也可以被翻译成患者的“关键佩戴时间”。

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