Adhesion and friction between glass and rubber in the dry state and in water: role of contact hydrophobicity,Soft Matter

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Adhesion and friction between glass and rubber in the dry state and in water: role of contact hydrophobicity
Soft Matter ( IF 2.9 ) Pub Date : 2018-06-20 00:00:00 , DOI: 10.1039/c8sm00847g
S. Kawasaki _{1,

2,

3,

4} , T. Tada _{1,

2,

3,

4} , B. N. J. Persson _{5,

6,

7,

8}

Affiliation

We study the contact mechanics between 3 different tire tread compounds and a smooth glass surface in water. We study both adhesion and sliding friction at low-sliding speeds. For 2 of the compounds the rubber–glass contact in water is hydrophobic and we observe adhesion, and slip-stick sliding friction dynamics. For one compound the contact is hydrophilic, resulting in vanishing adhesion, and steady-state (or smooth) sliding dynamics. We also show the importance of dynamical scrape, both on the macroscopic level and at the asperity level, which reduces the water film thickness between the solids during slip. The experiments show that the fluid is removed much faster from the rubber–glass asperity contact regions for a hydrophobic contact than for a hydrophilic contact. We also study friction on sandblasted glass in water. In this case all the compounds behave similarly and we conclude that no dewetting occur in the asperity contact regions. We propose that this is due to the increased surface roughness which reduces the rubber–glass binding energy.

中文翻译：

玻璃和橡胶在干燥状态和水中的粘附和摩擦：接触疏水性的作用

我们研究了3种不同的轮胎胎面胶与光滑的玻璃表面在水中的接触机理。我们研究在低滑动速度下的附着力和滑动摩擦。对于其中的两种化合物，橡胶与玻璃在水中的接触是疏水的，我们观察到了粘附力以及滑杆的滑动摩擦动力学。对于一种化合物，接触是亲水的，从而导致附着力消失和稳态（或平滑）滑动动力学。我们还显示了在宏观层面和粗糙层面上进行动力刮擦的重要性，这可以减小打滑过程中固体之间的水膜厚度。实验表明，与亲水接触相比，疏水接触从橡胶-玻璃粗糙接触区域的去除要快得多。我们还研究了喷砂玻璃在水中的摩擦。在这种情况下，所有化合物的行为都相似，我们得出的结论是，在粗糙接触区域中不会发生任何润湿现象。我们认为这是由于增加的表面粗糙度降低了橡胶与玻璃的结合能。

更新日期：2018-06-20

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