Roughness tolerant pressure sensitive adhesives made of sticky crumpled sheets
Roughness tolerant pressure sensitive adhesives made of sticky crumpled sheets
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由粘性褶皱片材制成的耐粗糙压敏粘合剂
DOI：
10.1039/d2sm00858k
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Croll, Andrew B.
中科院分区：
文献类型：
--
作者：
Elder, Theresa;Croll, Andrew B.
如果粘合剂是临时性的，那么粗糙度往往会给设计带来挑战。粘合剂可以变软，从而使其变形并增加表面接触，但通常情况下，较软的材料承受的载荷较小。生物灵感粘合剂由许多微米级的柱子制成，显示出作为耐粗糙度粘合剂的前景，但制造起来很复杂。在这项工作中，我们展示了当聚合物薄片被压皱成大致球形时，如何形成一种非常简单且耐粗糙度的粘接系统。我们使用微观和宏观实验来测量不同基材和起皱的聚二甲基硅氧烷片材之间的粘附力。我们发现，力-位移曲线类似于传统压敏胶粘剂的探针式实验，需要适度的拉力才能引发界面破坏。值得注意的是，我们发现粘性褶皱在长波长粗糙度上通常比在光滑基板上表现得更好。为了提高峰值拉力，我们用一层涂有粘合层的玻璃状聚合物聚碳酸酯薄片制作了一层粘性褶皱。这种弹塑性粘性褶皱即使在景观砖的粗糙表面上也能实现高拉力。
If an adhesive is meant to be temporary, roughness often poses a challenge for design. An adhesive could be made soft so that it can deform and increase surface contact but a softer material will in general hold a smaller load. Bioinspired adhesives, made with numerous microscale posts, show promise as roughness tolerant adhesives but are complicated to fabricate. In this work, we show how thin polymer sheets, when crumpled into a roughly spherical shape, form a very simple and roughness tolerant adhesive system. We use micro and macro-scale experiments to measure adhesion forces between various substrates and crumpled polydimethylsiloxane sheets. We find the force-displacement curves resemble probe-tack experiments of traditional pressure sensitive adhesives and that moderate tensile forces are required to initiate interfacial failure. Notably, we see that sticky crumples often perform better on long wavelength roughness than they do on smooth substrates. In order to improve the peak pull-off forces, we create a sticky crumple from a thin sheet of a glassy polymer, polycarbonate, coated with an adhesive layer. This elasto-plastic sticky crumple achieves high pull-off forces even on the rough surface of a landscaping brick.