Nacre-like GNP/Epoxy composites: Reinforcement efficiency vis-à-vis graphene content

Cilento, Fabrizia; Martone, Alfonso; Carbone, Maria Giovanna Pastore; Galiotis, Costas; Giordano, M.

doi:10.1016/j.compscitech.2021.108873

Cited by 24 publications

(15 citation statements)

References 43 publications

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“…The mechanical properties were higher for the hybrid composite than for GNP and Fe 2 O 3 as the sole filler in composites. In addition, the GNP as the sole filler shows higher reinforcement than Fe 2 O 3 as the sole filler; this is due to the higher reinforcement exhibited by GNP in rubber composite [29]. On the other hand, Fe 2 O 3 tends to exhibit lower reinforcing properties due to its poor reinforcing effect in composites.…”

Section: Under Static Compressive Strainmentioning

confidence: 97%

Soft Composites Filled with Iron Oxide and Graphite Nanoplatelets under Static and Cyclic Strain for Different Industrial Applications

2022

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Simultaneously exhibiting both a magnetic response and piezoelectric energy harvesting in magneto-rheological elastomers (MREs) is a win–win situation in a soft (hardness below 65) composite-based device. In the present work, composites based on iron oxide (Fe2O3) were prepared and exhibited a magnetic response; other composites based on the electrically conductive reinforcing nanofiller, graphite nanoplatelets (GNP), were also prepared and exhibited energy generation. A piezoelectric energy-harvesting device based on composites exhibited an impressive voltage of ~10 V and demonstrated a high durability of 0.5 million cycles. These nanofillers were added in room temperature vulcanized silicone rubber (RTV-SR) and their magnetic response and piezoelectric energy generation were studied both in single and hybrid form. The hybrid composite consisted of 10 per hundred parts of rubber (phr) of Fe2O3 and 10 phr of GNP. The experimental data show that the compressive modulus of the composites was 1.71 MPa (virgin), 2.73 (GNP), 2.65 MPa (Fe2O3), and 3.54 MPa (hybrid). Similarly, the fracture strain of the composites was 89% (virgin), 109% (GNP), 105% (Fe2O3), 133% (hybrid). Moreover, cyclic multi-hysteresis tests show that the hybrid composites exhibiting higher mechanical properties had the shortcoming of showing higher dissipation losses. In the end, this work demonstrates a rubber composite that provides an energy-harvesting device with an impressive voltage, high durability, and MREs with high magnetic sensitivity.

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Section: Under Static Compressive Strainmentioning

confidence: 97%

Soft Composites Filled with Iron Oxide and Graphite Nanoplatelets under Static and Cyclic Strain for Different Industrial Applications

2022

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“…22−24 properties of nacre-like Gr-based composites. These include the chemical compatibility between the filler and the matrix, 25,26 their interactions, the volume fraction of the filler, 27,28 the mobility of polymer chains, 27,29 the chemical functionalization of nanoplatelets and cross-linking, 30 and the efficiency of stress transfer between the filler and the matrix. 31,32 Although the random distribution of Gr in a PE matrix can enhance the thermo-mechanical properties of Grbased composites, the poor dispersion between Gr and the PE matrix leads to imperfect reinforcement.…”

Section: ■ Introductionmentioning

confidence: 99%

Mechanical and Viscoelastic Properties of Stacked and Grafted Graphene/Graphene Oxide–Polyethylene Nanocomposites: A Coarse-Grained Molecular Dynamics Study

Singh,

Ranganathan

2024

ACS Omega

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High-performance natural materials with superior mechanical properties often possess a hierarchical structure across multiple length scales. Nacre, also known as the mother of pearl, is an example of such a material and exhibits remarkable strength and toughness. The layered hierarchical architecture across different length scales is responsible for the efficient toughness and energy dissipation. To develop high-performance artificial nacre-like composites, it is necessary to mimic this layered structure and understand the molecular phenomena at the interface. This study uses coarse-grained molecular dynamics simulations to investigate the structure−property relationship of stacked graphene−polyethylene (PE) nanocomposites. Uniaxial and oscillatory shear deformation simulations were conducted to explore the composites' mechanical and viscoelastic behavior. The effect of grafting on the glass-transition temperature and the mechanical and viscoelastic behavior was also examined. The two examined microstructures, the stacked and grafted GnP (graphene nanoplatelet)−PE composites, demonstrated significant enhancement in the Young's modulus and yield strength when compared to the pristine PE. The study also delves into the viscoelastic properties of polyethylene nanocomposites containing graphene and graphene oxide. The grafted composite demonstrated an increased elastic energy and improved capacity for stress transfer. Our study sheds light on the energy dissipation properties of layered nanocomposites through underlying molecular mechanisms, providing promising prospects for designing novel biomimetic polymer nanocomposites.

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“…14 The dispersion of filler by melt mixing is somewhat compromised and largely dependent upon the extruder's sophistication and advancement extruder. 15 Cilento et al 16 examined the effect of GNPs content on the reinforcing performance of GNP/epoxy nanocomposite. It was found that the elastic modulus reaches its optimum between 53 and 67 vol% filler content, after which it begins to decrease with increasing loadings.…”

Section: Introductionmentioning

confidence: 99%

“…Cilento et al 16 examined the effect of GNPs content on the reinforcing performance of GNP/epoxy nanocomposite. It was found that the elastic modulus reaches its optimum between 53 and 67 vol% filler content, after which it begins to decrease with increasing loadings.…”

Section: Introductionmentioning

confidence: 99%

Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

Yusuf,

Sapuan,

Rashid

et al. 2023

Polymer Composites

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The efficient inclusion of GNPs (graphene nanoplatelets) as an effective nano‐fillers for green polymer matrices produced with 28% of carbon originating from biomass tends to significantly improve mechanical and thermal properties. In the present work, green epoxy nanocomposites with low loading of (0.1, 0.25, and 0.5) wt% of the GNPs were made using a solution blending technique using acetone as the solvent. In mechanical stirring, the ultrasonic bath was used to ensure the efficient dispersion of GNPs within green epoxy. The resulting nanocomposites were comprehensively characterized and compared to unfilled green epoxy. Different tools were used to appraise morphological, thermal, thermo‐mechanical, and mechanical behavior. The results confirmed through FE‐SEM showed an optimal dispersion of GNPs with nanocomposites. The thermal degradation temperature (Td) of GNPs curve with 0.25 wt% loading was shifted toward higher temperature (from 336°C to 342°C) due to low percentage of loading of GNPs which showed an enhance thermal stability of polymer matrix with 0.25 wt% loading. The mechanical results were also in lined with previously published literature, in the tensile test 6.45% and hardness 13.3% increment was achieved. Overall, the results underscored significant improvements in green nanocomposite performance with low wt% of GNPs.Highlights The study focuses on development and characterization of green epoxy nanocomposites, which utilize environmentally friendly materials as a matrix, highlighting the significance of sustainability. The study explores effects of low loading of GNPs in green epoxy nanocomposites. The results demonstrate significant improvements in mechanical and thermal properties with optimized presence of GNPs. This investigation provides insights into optimal amount of GNPs required to achieve improved properties. Research evaluates multifaceted analysis provides a holistic understanding of performance enhancements achieved through inclusion of GNPs.

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Nacre-like GNP/Epoxy composites: Reinforcement efficiency vis-à-vis graphene content

Cited by 24 publications

References 43 publications

Soft Composites Filled with Iron Oxide and Graphite Nanoplatelets under Static and Cyclic Strain for Different Industrial Applications

Soft Composites Filled with Iron Oxide and Graphite Nanoplatelets under Static and Cyclic Strain for Different Industrial Applications

Mechanical and Viscoelastic Properties of Stacked and Grafted Graphene/Graphene Oxide–Polyethylene Nanocomposites: A Coarse-Grained Molecular Dynamics Study

Thermal, mechanical, thermo‐mechanical and morphological properties of graphene nanoplatelets reinforced green epoxy nanocomposites

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