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首页> 外文期刊>SAE International Journal of Materials and Manufacturing >New Adhesive Bonding Surface Treatment Technologies for Lightweight Aluminum-Polypropylene Hybrid Joints in Semi-Structural Applications
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New Adhesive Bonding Surface Treatment Technologies for Lightweight Aluminum-Polypropylene Hybrid Joints in Semi-Structural Applications

机译：半结构应用中轻型铝-聚丙烯混合接头的新粘合表面处理新技术

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Atmospheric pressure plasma sources are new devices for modifying the surface condition of engineering materials such as thermoplastic and thermoset-based composites. Because they operate at ambient conditions, these plasma systems can be used on a production line as a pre-treatment solution prior to painting or adhesive bonding to significantly improve adhesion strength. However, their efficient use requires sound understanding on how they modify the surface state of materials and, by the same token, how these modifications can be detected and quantified as regards their ability to provide high-strength adhesive joints. Polypropylene, since it is one of the most difficult-to-bond thermoplastic polymers and, at the same time, one of the most interesting polymers for the automotive industry (due to low cost, widespread use in the formulation of composites, lightweight and recyclability), was used in this paper as a model polymer. Because adhesive bonding opens the door to the design of hybrid structures composed of virtually any combination of dissimilar materials, often impossible to esthetically marry otherwise, the efficacy of polypropylene surface modifications using two plasma systems was tested on adhesively bonded aluminum-polypropylene hybrid assemblies. Once pre-treated using atmospheric plasma sources, the polypropylene surfaces were also analyzed using surface science techniques, namely contact angle measurements, attenuated total reflectance infrared spectroscopy, and X-ray photoelectron spectroscopy. From the correlations established between the mechanical strength of adhesively bonded joints and surface features using surface science approaches, the role of surface and adhesive chemistries in providing semi-structural adhesive joints were determined. Indicators of performance for adhesive joints, based on fast infrared spectroscopy analyses, were found to be efficient for the systematic identification of promising adhesive-surface treatment combinations. The adhesion mechanisms of plasma-processed polypropylene are also presented.
机译：大气压等离子体源是用于改变工程材料（例如热塑性和热固性复合材料）表面状况的新设备。由于这些等离子系统在环境条件下运行，因此可以在生产线上用作涂漆或粘合剂粘合之前的预处理溶液，以显着提高粘合强度。然而，它们的有效使用要求对它们如何改变材料的表面状态以及出于同样的原因，就它们提供高强度胶粘接头的能力如何检测和量化这些改变，有深刻的了解。聚丙烯，因为它是最难粘合的热塑性聚合物之一，同时也是汽车工业中最有趣的聚合物之一（由于低成本，在复合材料配方中的广泛使用，轻质和可回收性），在本文中用作模型聚合物。由于粘合剂键合为几乎由异种材料的任意组合组成的混合结构的设计打开了大门，因此从美学上讲通常不可能与其他材料结合使用，因此在粘合剂铝-聚丙烯混合键合组件上测试了使用两种等离子体系统进行聚丙烯表面改性的功效。一旦使用大气等离子体源进行了预处理，聚丙烯表面也将使用表面科学技术进行分析，即接触角测量，衰减全反射红外光谱和X射线光电子能谱。根据使用表面科学方法建立的粘合接头的机械强度与表面特征之间的相关性，确定了表面和粘合化学在提供半结构粘合接头中的作用。发现基于快速红外光谱分析的胶粘接头性能指标对于系统地鉴定有希望的胶粘剂表面处理组合是有效的。还介绍了等离子处理聚丙烯的粘合机理。

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