Effect of reduced graphene oxide on mechanical behavior of an epoxy adhesive in glassy and rubbery states

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Khabaz Aghdam, A (Author) Other; Behjat, B (Author) Other; Marques, EAS (Author) FEUP; Ricardo Carbas (Author) FEUP; da Silva, LFM (Author) FEUP; Roghani Mamaqani, H (Author) Other

Journal

Title: Journal of Composite Materials

Vol. 55 No. 22

Pages: 3839-3848

ISSN: 0021-9983

Publisher: SAGE

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00V-968

DOI: 10.1177/00219983211031659

Abstract (EN): The mechanical behavior of an adhesive, in neat state and reinforced with up to 0.5 wt% of reduced graphene oxide (RGO) was investigated here. Tests were done at temperatures between the ambient temperature and the glass transition temperature (T-g ) of the adhesive. Using a metal mold, cured plates of the neat and RGO reinforced epoxy adhesive were prepared. The adhesive powder and the bulk dumbbell-shaped specimens, obtained from cured adhesive plates, were subjected to differential scanning calorimetry (DSC) and tensile tests, respectively, to obtain the T-g as well as mechanical properties of the adhesives. The results indicated that adding RGO up to 0.5 wt% increased the glass transition temperature, the modulus of elasticity, and the strength of the adhesive. It was found that the presence of RGO reduced the adhesive's strain at the break at the ambient temperature. However, at high temperatures, near the T-g, the ultimate strain of RGO-reinforced adhesives decreased slightly when compared to the ultimate strain of the neat specimens. This explains the reduction in toughness at ambient temperature obtained by adding RGO and the increase at high temperatures. Finally, the failure morphology of the neat and RGO-reinforced adhesive specimens was investigated using microscopic imaging of the specimens' failure cross-sections, which supported and justified the experimental observations.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10