Journal
POLYMER COMPOSITES
Volume 43, Issue 12, Pages 8673-8686Publisher
WILEY
DOI: 10.1002/pc.27049
Keywords
carbon nanotubes; glass fiber reinforced polymer; graphene nanoplatelets; hybrid; seawater aging
Categories
Funding
- Centro Mexicano de Innovacion en Energia del Oceano (CEMIE-O)
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This study experimentally investigates the influence of seawater aging on the flexural and thermomechanical properties of glass fiber/epoxy composites. The results show that seawater aging significantly reduces the mechanical and thermomechanical properties of the composite laminates. However, hybrid MWCNT/GNP-GF/E composites exhibit better resistance to seawater aging, making them suitable for marine applications.
The influence of seawater aging on the flexural and thermomechanical properties of glass fiber/epoxy (GF/E) composites containing the hybrid combination of multiwall carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) was experimentally investigated in this work. The three-point bending and dynamic mechanical analysis were performed to test flexural modulus, flexural strength, strain to failure, storage modulus, and glass transition temperature (T-g) of hybrid MWCNT/GNP-GF/E composites at different mixing ratios (1:0, 7:1, 3:1, and 0:1) which were immersed in seawater at 60 degrees C. The results confirm that seawater aging plays a significant role in reducing the mechanical and thermomechanical properties of hierarchical composite laminates due to degradation and weakening of the fiber/matrix interface as a consequence of plasticization and swelling effects of the polymer matrix. Despite this serious physical degradation, MWCNT/GNP-GF/E hybrid composites with (7:1) showed a better resistance to seawater aging, with slight improvements in flexural strength (2%), strain to failure (14%), and T-g (12%) compared to neat GF/E composites, due to positive synergistic effect of the carbon nanostructures in the composite laminates, making them suitable for marine applications.
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