Surface plasma treatment effect on shear strength in adhesively bonded joints with modified addition curing silicone adhesive

IF 3.2 3区 材料科学 Q2 ENGINEERING, CHEMICAL
Mohammad Hossein Jazayeri , Majid Mokhtari
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Abstract

Strong single lap bonded joints of different materials are of great importance in various advanced industries. Silicones are commonly used as reliable adhesives for this purpose. Although silicones offer excellent properties such as resistance to extreme temperatures and weather conditions, as well as flexibility, their low surface energy limits their application as adhesives. To address this issue, we added a hydrogen-containing silicone adhesion promoter to an addition-curing silicone adhesive. We also introduced functional groups on the aluminum and glass adherends through air plasma (AP) surface treatment. These modifications were made to improve the interface between the adhesive and the adherend. We also added hydrophobic fumed silica to the adhesive formulation to enhance its overall bond strength and toughness. The single lap-shear tests were carried out to study the lap-shear strength (LSS) of the adhesively bonded joints. It was shown that the presence of the adhesion promoter on AP-treated adherends results in a minimum increase of 196 % in LSS. It was observed that the adhesion promoter has a plasticizing effect in the absence of AP treatment, resulting in poor mechanical strength of the joints. Fumed silica has been shown to significantly impact the LSS of aluminum and glass adherends, increasing it by a factor of 3 and 4, respectively, at the concentration of 5 phr. In all cases, glass specimens exhibited stronger bonds.

Abstract Image

表面等离子体处理对添加改性硫化硅胶粘剂粘合接头抗剪强度的影响
不同材料的强单搭接接头在各种先进工业中具有重要意义。硅树脂通常被用作可靠的粘合剂。尽管有机硅具有优异的性能,如耐极端温度和天气条件,以及灵活性,但其低表面能限制了其作为粘合剂的应用。为了解决这个问题,我们在添加固化的有机硅粘合剂中添加了含氢的有机硅粘合促进剂。我们还介绍了通过空气等离子体(AP)表面处理铝和玻璃粘附体上的官能团。这些改性是为了改善胶粘剂和粘附物之间的界面。我们还在粘合剂配方中添加了疏水性气相二氧化硅,以提高其整体粘合强度和韧性。采用单次搭剪试验研究了粘接接头的搭剪强度。结果表明,在ap处理的粘附体上存在粘附促进剂可使LSS最少增加196%。观察到,在未进行AP处理的情况下,粘结促进剂具有塑化作用,导致接头的机械强度较差。气相二氧化硅已被证明对铝和玻璃附着物的LSS有显著影响,在浓度为5 phr时,LSS分别增加了3倍和4倍。在所有情况下,玻璃样品都表现出更强的化学键。
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来源期刊
International Journal of Adhesion and Adhesives
International Journal of Adhesion and Adhesives 工程技术-材料科学:综合
CiteScore
6.90
自引率
8.80%
发文量
200
审稿时长
8.3 months
期刊介绍: The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.
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