Effect of exfoliation medium on the morphology of multi-layer graphene oxide and its importance for Poly(Ethylene terephthalate) based nanocomposites

Pinto, Gabriel; Silva, Giovanna da C.; Fechine, Guilhermino J. M.

doi:10.1016/j.polymertesting.2020.106742

Cited by 15 publications

(1 citation statement)

References 63 publications

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“…Specifically, the layered nanoparticles were used as fillers for polymeric matrices [25][26][27][28][29]. The unique properties of these two-dimensional materials (2DMs) are very attractive and lead to the production of high-performance nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

2023

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This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS2) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS2) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS2 particles; however, the degradation reactions were slowed down at higher MoS2 contents (>0.003%). The SEC results proved the stabilizer effect due to MoS2 particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS2 acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%).

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Section: Introductionmentioning

confidence: 99%

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

2023

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Enhanced thermally conductive TPU/graphene filaments for 3D printing produced by melt compounding

Maldonado

Pinto

Costa

et al. 2022

J of Applied Polymer Sci

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Conducting polymers are a potential solution to the issue of wide-range manufacture of flexible electronics, since many polymers are suitable to advanced fabrication methods, such as fused deposition modeling (FDM) 3D printing.Therefore, it is proposed in this work a ductile thermoplastic polyurethane (TPU)/graphene nanocomposite with enhanced thermal conductivity that would be suitable for additive manufacturing processes. The nanocomposites were produced by melt compounding technique, which does not require the use of toxic solvents and is characteristic of being used by the thermoplastic industry. The filaments were then analyzed in terms of graphene dispersion, microstructural changes, mechanical behavior, and thermal conductivity. It was verified that graphene does not have a good interaction with the TPU matrix, presenting voids at the interface and forming agglomerates at higher contents. However, it was able to affect the TPU's hard segments organization, leading to a more ordered structure up to 1.0 wt%. Consequently, the thermal conductivity was enhanced up to the graphene concentration by about 14% in relation to neat TPU. Additionally, even though the system presented a poor interface, no mechanical properties were lost, that is, the composite remained ductile even after graphene insertion, which is extremely interesting for additive manufacturing processes.

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Balancing thermal conductivity, dielectric, and tribological properties in polyamide 1010 with 2D nanomaterials

Pinto,

Staffa,

Helal

et al. 2024

J of Applied Polymer Sci

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Low electrical conductivity and high heat dissipation are crucial for electronic packaging materials. Additionally, friction is critical for the lifespan and energy efficiency of components. To address these requirements, polymer nanocomposites based on bio‐based polyamide 1010 and ultra‐low contents of 2D nanomaterials were produced by melt‐blending. Graphene oxide, hexagonal boron nitride, and molybdenum disulfide were selected for their two‐dimensional structure and electrical insulation, providing high thermal conductivity while preserving the polymer's dielectric nature. Hybrid nanocomposites were also produced to explore potential synergistic effects. Results showed all compositions maintained the polymer's intrinsic dielectric properties. Although the friction coefficient increased slightly compared with neat polyamide, all nanocomposites remained within the low‐friction range required for low‐friction materials. Thermal conductivity improved by 5%–10% compared with unfilled polyamide, with hybrid systems performing slightly better, indicating a minor synergistic effect. Despite these enhancements being modest compared with the literature, achieving high thermal conductivity usually requires over 20 wt% of nanofiller, which is detrimental to mechanical performance. In this study, at most 0.5 wt% was used, with composites being obtained directly through melt‐blending. This highlights their potential as low‐content additives for thermal interface materials without compromising other essential properties.

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Effect of exfoliation medium on the morphology of multi-layer graphene oxide and its importance for Poly(Ethylene terephthalate) based nanocomposites

Cited by 15 publications

References 63 publications

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

Enhanced thermally conductive TPU/graphene filaments for 3D printing produced by melt compounding

Balancing thermal conductivity, dielectric, and tribological properties in polyamide 1010 with 2D nanomaterials

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