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

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Borges, CSP (Author) Other; Marques, EAS (Author) FEUP; Ricardo Carbas (Author) FEUP; Akhavan Safar, A (Author) Other; Ueffing, C (Author) Other; Weissgraeber, P (Author) Other; da Silva, LFM (Author) FEUP

Journal

Title: Polymers

Vol. 15

Final page: 788

Publisher: MDPI

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00X-ZQY

DOI: 10.3390/polym15040788

Abstract (EN): 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 degrees 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19