Influence of Acrylic Adhesive Viscosity and Surface Roughness on the Properties of Adhesive Joint

材料科学 复合材料 润湿 胶粘剂 粘度 接触角 表面粗糙度 表面张力 搭接接头 固化(化学) 韧性 表面光洁度 表面能 图层(电子) 物理 量子力学
作者
Eva Paz,Julián José Narbón Prieto,J. Abenójar,María del Mar Cledera Castro,Juan Carlos del Real Romero
出处
期刊:Journal of Adhesion [Taylor & Francis]
卷期号:92 (11): 877-891 被引量:43
标识
DOI:10.1080/00218464.2015.1051221
摘要

In adhesion, the wetting process depends on three fundamental factors: the surface topography of the adherend, the viscosity of the adhesive, and the surface energy of both. The aim of this paper is to study the influence of viscosity and surface roughness on the wetting and their effect on the bond strength. For this purpose, an acrylic adhesive with different viscosities was synthesized and some properties, such as viscosity and surface tension, were studied before adhesive curing took place. Furthermore, the contact angle and the lap-shear strength were analyzed using aluminum adherends with two different roughnesses. Scanning electron microscopy was used to determine the effect of the viscosity and the roughness on the joint interface. The results showed that the adhesive exhibits an optimal value of viscosity. Below this value, at low viscosities, the low neoprene content produces poor bond strength due to the reduced toughness of the adhesive. Additionally, it also produces a high shrinkage during curing, which leads to the apparition of residual stresses that weakens the interfacial strength. However, once the optimum value, an increase in the viscosity produces a negative effect on the joint strength as a result of an important decrease in the wettability.
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