INM - Leibniz Institute for New Materials, Campus D2 2, Saarbrücken, Germany; Department of Materials Science and Engineering, Saarland University, Campus D2 2, Saarbrücken, Germany.
INM - Leibniz Institute for New Materials, Campus D2 2, Saarbrücken, Germany.
J Mech Behav Biomed Mater. 2018 Apr;80:303-310. doi: 10.1016/j.jmbbm.2018.01.032. Epub 2018 Jan 31.
For designing new skin adhesives, the complex mechanical interaction of soft elastomers with surfaces of various roughnesses needs to be better understood. We systematically studied the effects of a wide set of roughness characteristics, film thickness, hold time and material relaxation on the adhesive behaviour of the silicone elastomer SSA 7-9800 (Dow Corning). As model surfaces, we used epoxy replicas obtained from substrates with roughness ranging from very smooth to skin-like. Our results demonstrate that films of thin and intermediate thickness (60 and 160 µm) adhered best to a sub-micron rough surface, with a pull-off stress of about 50 kPa. Significant variations in pull-off stress and detachment mechanism with roughness and hold time were found. In contrast, 320 µm thick films adhered with lower pull-off stress of about 17 kPa, but were less sensitive to roughness and hold time. It is demonstrated that the adhesion performance of the silicone films to rough surfaces can be tuned by tailoring the film thickness and contact time.
为了设计新型的皮肤粘合剂，需要更好地理解软弹性体与各种粗糙度表面之间的复杂机械相互作用。我们系统地研究了广泛的粗糙度特征、薄膜厚度、保持时间和材料松弛对硅酮弹性体 SSA 7-9800（道康宁）粘合性能的影响。作为模型表面，我们使用了从非常光滑到类似皮肤的粗糙度范围的基底获得的环氧树脂复制品。我们的结果表明，厚度为 60 和 160 µm 的薄膜在亚微米粗糙表面上的附着力最佳，剥离强度约为 50 kPa。发现剥离强度和分离机制随粗糙度和保持时间显著变化。相比之下，320 µm 厚的薄膜的剥离强度较低，约为 17 kPa，但对粗糙度和保持时间的敏感性较低。结果表明，可以通过调整薄膜厚度和接触时间来调节硅酮薄膜对粗糙表面的粘附性能。
