Sultana, S. M. Nourin, Helal, Emna, Gutiérrez, Giovanna, David, Eric, Moghimian, Nima et Demarquette, Nicole R..
2024.
« The influence of a commercial few-layer graphene on electrical conductivity, mechanical reinforcement and photodegradation resistance of polyolefin blends ».
Crystals, vol. 14, nº 8.
Compte des citations dans Scopus : 1.
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Résumé
This work demonstrates the potentials of a commercially available few-layer graphene (FLG) in enhancing the electro-dissipative properties, mechanical strength, and UV protection of polyolefin blend composites; interesting features of electronic packaging materials. Polyethylene (PE)/ polypropylene (PP)/ FLG blend composites were prepared following two steps. Firstly, different concentrations of FLG were mixed with either the PE or PP phases. Subsequently, in the second step, this pre-mixture was melt-blended with the other phase of the blend. FLG-filled composites were characterized in terms of electrical conductivity, morphological evolution upon shear-induced deformation, mechanical properties, and UV stability of polyolefin blend composites. Premixing of FLG with the PP phase has been observed to be a better mixing strategy to attain higher electrical conductivity in PE/PP/FLG blend composite. This observation is attributed to the influential effect of FLG migration from a thermodynamically less favourable PP phase to a favourable PE phase via the PE/PP interface. Interestingly, the addition of 4 wt.% (~2 vol.%) and 5 wt.% (~2.5 vol.%) of FLG increased an electrical conductivity of ~10 orders of magnitude in PE/PP—60/40 (1.87 × 10−5 S/cm) and PE/PP—20/80 (1.25 × 10−5 S/cm) blends, respectively. Furthermore, shear-induced deformation did not alter the electrical conductivity of the FLG-filled composite, indicating that the conductive FLG network within the composite is resilient to such deformation. In addition, 1 wt.% FLG was observed to be sufficient to retain the original mechanical properties in UV-exposed polyolefin composites. FLG exhibited pronounced UV stabilizing effects, particularly in PE-rich blends, mitigating surface cracking and preserving ductility.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Professeur: | Professeur David, Éric Demarquette, Nicole R. |
| Affiliation: | Génie mécanique, Génie mécanique, Génie mécanique |
| Date de dépôt: | 20 sept. 2024 18:19 |
| Dernière modification: | 28 oct. 2024 15:24 |
| URI: | https://espace2.etsmtl.ca/id/eprint/29551 |
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