Although surface chemistry is less important in dry adhesion than surface geometry, it may still prevent reliable attachment from being established in shear-activated adhesives. However, some materials can be more universal than others in their adhesive interaction with random counterfaces. To identify a material that would be preferable for use in dry adhesives, here we studied the attachment properties of polyurethane (PU) in contact with several substrates of different chemical compositions. It was found that the pull-off and static friction forces measured with our PU-based adhesive are only moderately sensitive to the counterface chemistry, which makes PU a good material of choice for dry attachment systems. In addition, the effect of counterface roughness was clearly demonstrated to dominate over the effect of counterface chemical composition.

中文翻译：

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聚氨酯剪切活化胶粘剂：对面化学作用

尽管表面化学在干式粘合中的重要性不如表面几何形状，但它仍可能阻止在剪切活化粘合剂中建立可靠的附着。但是，某些材料在与随机对立面的粘合作用方面可能比其他材料更通用。为了确定一种适合用于干式粘合剂的材料，我们在这里研究了聚氨酯（PU）与几种不同化学成分的基材接触时的附着性能。结果发现，使用我们的PU基胶粘剂测量的剥离力和静摩擦力仅对底面化学性质敏感，这使PU成为干式连接系统的理想选择。此外，