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| Azevedo, Nuno Monteiro |
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Fernberg, Patrik
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Publications (6/6 displayed)
- 2024Equivalent stress concept to account for the effect of local cyclic stress ratio on transverse cracking in tension–tension fatiguecitations
- 2024Effect of heat treatment and test temperature on transverse cracking in tensile loadingcitations
- 2022The Influence of Ethynyl In-Chain Crosslinkers on the Properties of 6FDA-Based Polyimidescitations
- 2008Damage detection in carbon fibre cross-ply laminates by aid of carbon nanotube doped resin
- 2002Toughness of short fiber composites : an approach based on crack-bridging
- 2000Fiber bridging concepts applied to short fiber composites
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article
The Influence of Ethynyl In-Chain Crosslinkers on the Properties of 6FDA-Based Polyimides
Abstract
<jats:p>Two 4,4′-(hexafluoroisopropylidene)diphthalic anhydride-based thermosetting polyimide formulations with varied amounts of crosslinking sites were compared to understand the influence of crosslinking density on fracture toughness, glass transition temperature and thermal oxidative stability. The thermal and mechanical properties of both materials were investigated through a series of single-edge notched beams, differential scanning calorimetry, dilatometry, weight loss, light optical microscopy and nanoindentation experiments. It was found out that the reduced crosslinking resulted in slightly increased fracture toughness but decreased the Tg of the material. No significant difference could be observed in the thermal oxidative stability with the experimental techniques considered.</jats:p>