Influence of water and surfactant contamination on the mechanical and chemical properties of a silicone adhesive before and after curing

Borges, Catarina S. P.; Brandão, R.; Akhavan‐Safar, A.; Marques, E.A.S.; Carbas, R.J.C.; Ueffing, Christoph; Weißgraeber, Philipp; Schmid, Florian; Silva, Lucas F. M. da

doi:10.1080/00218464.2022.2082291

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…Khalilullah et al [ 14 ] also studied silicone rubbers and concluded that not only does the material follow a Fickian law of diffusion, but also that the Arrhenius law can be used to describe the influence of temperature and relative humidity on the increase in the diffusion coefficient of the material. The same conclusions were reached by Borges et al [ 15 ], that studied the same silicone adhesive used in this work. However, there are authors that use different diffusion laws, such as Lutz et al [ 16 ], that used the Langmuir model to describe the water diffusion on high temperature vulcanized silicone (HTV-SR), and Fang et al [ 17 ].…”

Section: Introductionsupporting

confidence: 91%

“…The water uptake behavior of PBT-GF30 and silicone has already been determined in other work by the same authors [ 15 , 30 ]. Therefore, it is possible to conduct a numerical simulation that is going to predict the mass gain of the adhesive and substrate and, finally:

where N refers to numerically defined.…”

Section: Methodsmentioning

confidence: 59%

“…Over the tested time period, the material increased its strength and stiffness. Borges et al [ 15 ], studying the same material used in this work, concluded that water immersion does not significantly change the properties of the adhesive for immersions in a water container placed in a climatic chamber at temperatures between 70 and 130 °C.…”

Section: Introductionmentioning

confidence: 88%

“…The silicone adhesive is also used to bond the housing to a heat sink, manufactured from aluminum. As said, the bulk materials, adhesive and substrate, were already studied in terms of water diffusion behavior and its effect on the mechanical properties [ 15 , 30 ]. Additionally, the effect of moisture on SLJs and DCBs with PBT-GF30 substrates and the same silicone adhesive was analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…To isolate the water diffusion behavior of the interphase, for both substrate materials, rectangular joints (RJ) with 0.5, 1, and 2 mm of adhesive thickness were prepared. A gravimetric study was performed and, knowing the water diffusion behavior of the bulk materials at this temperature, determined in previous studies [ 15 , 30 ], the diffusion at the interphase was isolated. Afterwards, SLJs with the same adhesive thicknesses were prepared, and tested before water aging.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Interface/Interphase on the Water Ingress Properties of Joints with PBT-GF30 and Aluminum Substrates Using Silicone Adhesive

et al. 2023

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The aim of this work is to analyze the difference between silicone/composite and silicone/metal interphases, both in terms of water diffusion behavior and failure of the aged joints. For that, silicone joints with two different suhbstrates were prepared. The substrates were polybutylene terephthalate with 30% of short glass fiber (PBT-GF30) and 6082-T6 aluminum. It is assumed that the water uptake of the joints is equal to the water uptake of the substrate, adhesive, and interphase. Therefore, knowing the first three, the last could be isolated. To study the water diffusion behavior of the complete joint, rectangular joints were prepared, immersed in water and their water uptake was measured. The water immersion was conducted at 70∘C. It was concluded that the aluminum/silicone joints absorbed more water through the interphase region than the PBT-GF30/silicone joints, since the difference between the expected water uptake and the experimentally measured mass gain is significantly higher, causing adhesive failure of the joint. The same was not observed in the PBT-GF30/silicone, with a more stable interphase, that does not absorb measurable quantities of water and always exhibits cohesive failure.

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