Main structural features of graphene materials controlling the transport properties of epoxy resin-based composites

Sánchez-Hidalgo, R.; Yuste-Sánchez, V.; Verdejo, Raquel; Blanco, Clara; López–Manchado, Miguel A.; Menéndez, Rosa

doi:10.1016/j.eurpolymj.2018.02.018

Cited by 18 publications

(18 citation statements)

References 56 publications

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“…The Au 4f photoelectron line was used as energy reference. The Multipack software was used for fitting the curves using a pseudo-Voigt adjustment (80% Gaussian and 20% Lorentzian) [41]. This allowed the identification C sp 2 hybridized carbon and the bands attributed to the main functional groups [42].…”

Section: Characterization Of Go and Trgo Particlesmentioning

confidence: 99%

“…After thermal reduction, the diffraction spectra of TrGO particles showed a small and broad peak at around 25 • , indicating a material without laminar graphite order corresponding to random platelets of corrugated structure [53]. Due to the gases released during the thermal reduction of GO functional groups, such as the hydroxyl and epoxy groups [41], pressure is generated between the stacked graphene layers which is higher than the necessary for its separation producing a volumetric expansion of up to 300 times, resulting in TrGO layers of low apparent density [54]. The presence of chemical functional groups in GO and TrGO particles was confirmed by narrow XPS scans as displayed in Figure 2b.…”

Section: Characterization Of Graphene-based Particlesmentioning

confidence: 99%

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Electroactive 3D Printed Scaffolds Based on Percolated Composites of Polycaprolactone with Thermally Reduced Graphene Oxide for Antibacterial and Tissue Engineering Applications

et al. 2020

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Applying electrical stimulation (ES) could affect different cellular mechanisms, thereby producing a bactericidal effect and an increase in human cell viability. Despite its relevance, this bioelectric effect has been barely reported in percolated conductive biopolymers. In this context, electroactive polycaprolactone (PCL) scaffolds with conductive Thermally Reduced Graphene Oxide (TrGO) nanoparticles were obtained by a 3D printing method. Under direct current (DC) along the percolated scaffolds, a strong antibacterial effect was observed, which completely eradicated S. aureus on the surface of scaffolds. Notably, the same ES regime also produced a four-fold increase in the viability of human mesenchymal stem cells attached to the 3D conductive PCL/TrGO scaffold compared with the pure PCL scaffold. These results have widened the design of novel electroactive composite polymers that could both eliminate the bacteria adhered to the scaffold and increase human cell viability, which have great potential in tissue engineering applications.

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Section: Characterization Of Go and Trgo Particlesmentioning

confidence: 99%

Section: Characterization Of Graphene-based Particlesmentioning

confidence: 99%

Electroactive 3D Printed Scaffolds Based on Percolated Composites of Polycaprolactone with Thermally Reduced Graphene Oxide for Antibacterial and Tissue Engineering Applications

et al. 2020

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“…With respect to the BET surface area results of the nanoparticles, also shown in Table , it can be seen that the surface area increase from 69 m 2 /g for GO to 304 and 210 m 2 /g for TRGO 600 and TRGO 800 , respectively. This increase of the surface area is due to the elimination of small molecules and oxygen groups caused by the rapid expansion of the graphite . The lower surface area of the TRGO 800 compared with the TRGO 600 is likely due to a re‐stacking of the nanoparticles.…”

Section: Resultsmentioning

confidence: 97%

“…Therefore, although the functional groups on the surface of the TRGO nanoparticles can affect the interaction with PP and PA6 matrices, BET surface area plays a crucial role in the dispersion of the nanoparticles in the polymer matrices, being the most important factor to be considered. Similar results have been found in the dispersion of TRGO reduced at different temperatures in epoxy resin composites, where BET surface area resulted the key factor for their dispersion .…”

Section: Resultsmentioning

confidence: 97%

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Effect of thermally reduced graphene oxides obtained at different temperatures on the barrier and mechanical properties of polypropylene/TRGO and polyamide‐6/TRGO nanocomposites

et al. 2018

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Polypropylene (PP) and polyamide‐6 (PA6) nanocomposites containing thermally reduced graphene oxide (TRGO), obtained either at 600°C (TRGO600) or 800°C (TRGO800), were prepared by melt mixing in order to study the effect of the thermal treatments on their barrier and mechanical properties. Transmission electron microscopy images of nanocomposites showed a relative good dispersion of TRGO in polymer matrices with some agglomerations. Differential scanning calorimetry analyses showed a slight reduction in crystallinity for both polymers in the presence of TRGO. The permeability to oxygen and water vapor was decreased in almost all nanocomposites due to a more tortuous path to gas permeation, being more evident for PP/TRGO800. Tensile stress–strain tests showed that all nanocomposites had higher elastic modulus, but PA6/TRGO600 nanocomposites showed better mechanical properties. These findings indicated that TRGO obtained at a higher temperature imparts better barrier and mechanical properties to PP, while TRGO obtained at a lower temperature imparts better barrier and mechanical properties to PA6. POLYM. COMPOS., 40:E1746–E1756, 2019. © 2018 Society of Plastics Engineers

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Synthesis of a novel boron‐containing hyperbranched benzoxazine and its flame‐retardant properties in copolymer with epoxy resin

Cheng

Cai

Wang

et al. 2023

Polymers for Advanced Techs

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A novel boron‐containing hyperbranched benzoxazine (HB‐B) was synthesized from the reaction of triethanolamine borate (BAE), bisphenol‐A, and paraformaldehyde via Mannich condensation. The chemical structures of BAE and HB‐B were characterized by Fourier transform infrared (FT‐IR) and hydrogen nuclear magnetic resonance (1H NMR). Afterward, the boron‐containing hyperbranched benzoxazine/epoxy resin copolymers (E51/HB‐B) were prepared. The curing behavior of ‐B and E51/HB‐B was studied by FT‐IR and differential scanning calorimeter (DSC). The thermal stability and flame retardancy properties of the cured HB‐B and E51/HB‐B were evaluated by thermogravimetric analyzer (TGA), limited oxygen index (LOI), UL94 rating test, and microscale combustibility calorimeter experiments (MCC). The initial thermal decomposition temperature and glass transition temperature steadily dropped with increasing HB‐B content, while the char yield kept rising. The LOI value of the E51/HB‐B‐12 wt% was 31.8%, meeting the UL94 V‐0 specification. The result of heat release capacity (HRC) decreased by 20.4%. Moreover, the mechanical properties were also improved, and the tensile strength of E51/HB‐B copolymer was increased by 88.5%. Finally, the fracture morphology of E51/HB‐B was characterized by SEM.

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Main structural features of graphene materials controlling the transport properties of epoxy resin-based composites

Cited by 18 publications

References 56 publications

Electroactive 3D Printed Scaffolds Based on Percolated Composites of Polycaprolactone with Thermally Reduced Graphene Oxide for Antibacterial and Tissue Engineering Applications

Electroactive 3D Printed Scaffolds Based on Percolated Composites of Polycaprolactone with Thermally Reduced Graphene Oxide for Antibacterial and Tissue Engineering Applications

Effect of thermally reduced graphene oxides obtained at different temperatures on the barrier and mechanical properties of polypropylene/TRGO and polyamide‐6/TRGO nanocomposites

Synthesis of a novel boron‐containing hyperbranched benzoxazine and its flame‐retardant properties in copolymer with epoxy resin

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