Influence of addition curing silicone formulation and surface aging of aluminum adherends on bond strength |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China;2. School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing, 100191, China;1. Department of Prosthodontics, National and Kapodistrian University of Athens, School of Dentistry, Athens, Greece;2. Section of Maxillofacial Prosthodontics and Oncologic Dentistry, Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, USA;3. Department of Biomaterials, National and Kapodistrian University of Athens, School of Dentistry, 2 Thivon Str., 11 527 Goudi, Athens, Greece;1. School of Materials Science and Engineering, JiangSu University of Science and Technology, ZhenJiang, 212003, PR China;2. School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, PR China;3. School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, PR China;4. Nanjing Tech University, Nanjing, 211816, PR China;1. Industrial Chemistry Research Institute, Department of Polymer Technology and Processing, Rydygiera 8, 01-793, Warsaw, Poland;2. D&R Dispersions and Resins Sp. z o.o., Duninowska 9, 87-800, Włocławek, Poland |
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| Abstract: | In spite of many studies, knowledge about the fundamental factors influencing adhesion between addition curing silicones and aluminum substrates is very limited. The aim of this publication is to evaluate the influence of the formulation and the surface state of the adherend on bond strength. For this purpose, the composition of an addition curing silicone was systematically varied and the effects on both material and bond properties were examined. Additionally, the influence of surface aging at different humidities (0% r. h., 34% r. h., 82% r. h.) of acid etch pretreated aluminum substrates was considered. It is shown that the mechanical properties of the silicone material can be easily adjusted over a wide range by changing the formulation. Although high tensile strengths up to 9.2 MPa for the silicone material can be achieved, lap-shear strengths remain moderate at approximately 3.5 MPa. Predominant adhesive failures show the limited adhesive strength of the basic formulation without additives. Basic ingredients of addition curing silicones without additives are able to reach a certain adhesive strength. However, this strength was quite limited and adhesion promoters are required to further improve adhesion. The humidity at which the pretreated substrates are stored has an overall minor influence on bond strength. Surprisingly, bond strength tends to increase with the storage time of aluminum substrates despite lower surface energies in comparison to freshly pretreated substrates. All in all, the storage conditions of aluminum had a rather small influence on adhesion, whereas the composition of the silicone adhesive strongly influences bond strength. |
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| Keywords: | Silicones (A) Aluminum (B) Lap-shear (C) Adhesion (D) Formulation Aging |
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