Nanocompósitos de matriz epoxídica com reforços produzidos a partir do grafite natural

Silva, Delne Domingos da; Santos, Wyllian Ficagna dos; Pezzin, Sérgio Henrique

doi:10.1590/s1517-70762013000200002

Cited by 7 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3(a) shows the FTIR spectrum of the EPS composite, in which characteristic bands can be identified from cellulose, lignin, epoxy, and catalytic groups. 21–23…”

Section: Resultsmentioning

confidence: 99%

Mechanical and microstructural characterization of epoxy/sawdust (Pinus elliottii) composites

Mendes

Fleming

Goncalves

et al. 2020

Polymers and Polymer Composites

View full text Add to dashboard Cite

The use of wood residues in polymeric matrices is notable for promoting significant mechanical reinforcement of the matrix. Such composites are widely used in the development of new composite materials with tunable mechanical properties for a variety of applications. In this work, polymeric composites with epoxy resin as the polymeric matrix and Pinus elliottii wood residue as the reinforcement were obtained. The composites were obtained by adding wood residue (sawdust) with particle sizes of 0.30, 0.60, and 1.19 millimeters into an epoxy matrix to determine the best mechanical properties of the composite as a function of the particle size. The polymer/sawdust composites were characterized by scanning electron microscopy (SEM), Infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and stress–strain tests. SEM images revealed a smooth and homogeneous surface free of defects and holes. However, lateral profile images showed the presence of fine sawdust particles agglomerated and a considerable number of bubbles and cavities that could interfere in the mechanical properties of the composites. The FTIR characterization of the composite identified the main bands related to epoxy and lignin/cellulose chains. The results of the mechanical properties suggested that epoxy composites with sawdust can increase its tensile strength according to the sawdust particle size introduced into the matrix.

show abstract

“…Figure 3(a) shows the FTIR spectrum of the EPS composite, in which characteristic bands can be identified from cellulose, lignin, epoxy, and catalytic groups. 21–23…”

Section: Resultsmentioning

confidence: 99%

Mechanical and microstructural characterization of epoxy/sawdust (Pinus elliottii) composites

Mendes

Fleming

Goncalves

et al. 2020

Polymers and Polymer Composites

View full text Add to dashboard Cite

show abstract

“…In this process, natural graphite (NG) is oxidized by a mixture of acids and oxidizing agents, promoting the oxidation of graphite to graphite oxide (GO), containing oxygenated functional groups. Subsequently, the GO undergoes a thermal expansion and is then converted to graphene by reducing agents [12,13].…”

Section: Introductionmentioning

confidence: 99%

Characterization of graphene nanosheets obtained by a modified Hummer's method

et al. 2018

Self Cite

View full text Add to dashboard Cite

Natural graphite is an inexpensive and abundant source to obtain graphene nanosheets. The most efficient method for large-scale production is the chemical method, which is based on the oxidation of natural graphite. This paper reports the synthesis and characterization of graphene obtained by the Hummers method with some modifications. The results indicate a high degree of graphite oxidation, proving that the process was efficient. Analyses of field emission scanning electron microscopy (FEG), transmission electron microscopy (TEM), Raman spectroscopy, thermogravimetric analysis (TGA) and X-ray diffraction showed that the graphene produced presented characteristics similar to the commercial graphene.

show abstract

“…This region contains epoxy rings indicating the degree of cure of the resin. The smaller the number of rings in that region the greater the degree of cure [7]. Thus, it was observed that the resin was completely cured at the submitted temperature of 80°C/4h.…”

Section: Nanocomposites Characterizationmentioning

confidence: 90%

“…Figure-1a and 1b refer to graphite and Figure 1c and 1d refer to graphene oxide (GO). From Figure 1c, a separation between the graphite layers was observed due to factors such as sonication, which creates separation between the sheets, and also the high oxygen content between the graphene sheets [7,15]. Figure 2 shows the infrared spectra normalized of (a) graphite and (b) graphene oxide (GO) and indicates the presence of oxygenated groups such as hydroxyl (O-H) at 3208 cm -1 [16], carbonyl (C=O) at 1714 cm -1 , carbon double bond (C=C) at 1621 cm -1 [17] and epoxy (CO) at 1372 cm -1 [18] in structure from GO.…”

Section: Graphene Oxide Characterizationmentioning

confidence: 99%

“…However, one of the major problems in the mixing process of these materials is the formation of agglomerates that may be detrimental to the final mechanical properties of the composites. Thus, solvents such as water, ethanol, tetrahydrofuran and acetone are used to enable a more homogeneous dispersion between matrix and reinforcement in the polymer composite [7].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Application of graphene oxide as (nano) reinforcement in epoxy composites

et al. 2022

View full text Add to dashboard Cite

Composite with nanometric particles have been used as a structural reinforcement to improve the mechanical properties in polymeric materials. The use of graphene has shown excellent results such as Young's modulus of 1 TPa, tensile strength of about 130 GPa, thermal conductivity of 5000 W/mK, electrical conductivity of up to 6000 S/cm, in addition to presenting great carrier mobility of loads of 2x105 cm2.V-1.s-1. Thus, the mechanical properties in the epoxy resin based on diglycidyl ether of bisphenol A were evaluated with the addition of increasing percentages of graphene oxide (GO) in order to evaluate the mechanical properties in this material. The synthesis of GO was made from natural graphite by the Hummers method. The nanostructured composites were manufactured with a mixture of 0.1%, 0.2%, 0.5% and 1% by weight of GO. The characterizations of the materials were made by FTIR-ATR, DRX, RAMAN, MEV and TGA. The mechanical properties were evaluated by increasing the impact energy Izod absorbed in composites with lower GO content. The results showed that with the increase in the amount of graphene oxide there was an increase in the mechanical properties and that the increase in the OG charge in the matrix generated agglomerations, impairing the impact absorption in the mechanical properties of the material making it necessary a rigorous process of dispersion of these nanometric materials in the polymeric matrix.

show abstract

Nanocompósitos de matriz epoxídica com reforços produzidos a partir do grafite natural

Cited by 7 publications

References 24 publications

Mechanical and microstructural characterization of epoxy/sawdust (Pinus elliottii) composites

Mechanical and microstructural characterization of epoxy/sawdust (Pinus elliottii) composites

Characterization of graphene nanosheets obtained by a modified Hummer's method

Application of graphene oxide as (nano) reinforcement in epoxy composites

Contact Info

Product

Resources

About