Three-dimensional porosity characterization in carbon/glass fiber epoxy hybrid composites

Monticeli, Francisco Maciel; Ornaghi, Heitor Luiz; Voorwald, Herman Jacobus Cornelis; Cioffi, Maria Odila Hilário

doi:10.1016/j.compositesa.2019.105555

Cited by 44 publications

(28 citation statements)

References 30 publications

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“…Since the 1960s, the use of synthetic fibers as reinforcement in epoxy resin composites increased dramatically due to its outstanding mechanical properties (Jawaid & Khalil, 2011). Epoxy composites have been produced with a variety of reinforcements including carbon fibers (Almeida, Ornaghi, Lorandi, Bregolin, & Amico, 2017), glass fibers (Sathishkumar, Sathishkumar, & Naveen, 2014), carbon/glass hybrids (Monticeli, Ornaghi, Woorwald, & Cioffi, 2019), carbon/aramid hybrids (Pincheira, Canales, Medina, Flores, & Ferna, 2018).…”

Section: Introduction and Global Scenariomentioning

confidence: 99%

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Neves

Ornaghi

Zattera

et al. 2021

Carbohydrate Polymers

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Cellulose and its derivatives are widely explored for films and thickening of pharmaceutical solutions, in paints, as reinforcement in composites, among others. This versatility is due to advantages such as renewability, low cost, and environmental friendliness. When used in polymer composites, due to the hydrophilic character of the cellulose, surface chemical modification is highly recommended to improve its compatibility with the polymeric matrix. Hence, this paper presents a systematic review of chemically modified cellulose/epoxy resin composites focusing on the last five years. The investigation followed the PRISMA protocol that delivers a meticulous summary of all available primary research in response to a research question. After including/excluding steps, thirty-six studies were included in the review. The results were presented focusing on thermal, mechanical and dynamic-mechanical properties of the composites. In brief, this methodology helped identifying the main gaps in knowledge in that field.

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Section: Introduction and Global Scenariomentioning

confidence: 99%

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Neves

Ornaghi

Zattera

et al. 2021

Carbohydrate Polymers

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“…The porosity gradient evidenced an increase along the laminate length due to differential pressure near injection and laminate end, driving the voids to the end of the composite length. In addition, there is a tendency toward lower porosity values being found at the inlet gate (AD 1–3), associated with resin‐rich regions, as well as an increase in porosity along the laminate length, due to the difficulties associated with impregnating plain weave fabric, considering higher tortuosity and flow resistance offers by the fabric, as evidenced in the literature . The results reported in this section were used to compare the void measurement methodologies in the next sections.…”

Section: Resultsmentioning

confidence: 95%

“…The composite cure procedure was performed at 180°C for 120 min. Processing parameters were following previous studies at literature , which shown maximum cure efficiency for the same resin and process used.…”

Section: Methodsmentioning

confidence: 99%

Porosity Characterization of Carbon Fiber/Epoxy Composite Using Hg Porosimetry and Other Techniques

Monticeli

Montoro

Voorwald

et al. 2020

Polymer Engineering & Sci

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In polymer composites, the porosity acts mainly as a stress concentrator, which has detrimental effects depending on the shape and position of the voids. Also, the presence of voids is detrimental to the mechanical properties, which results in the need for an accurate method for their characterization in terms of morphology, position, and volume fraction. The aim of this study was to establish an appropriate procedure for the measurement of voids in a polymer composite using the mercury porosimetry technique. Data were also collected using the Taguchi approach. Subsequently, the feasibility of applying the Hg porosimetry methodology was confirmed through a comparison with standard techniques. Statistical analysis was used to determine the best Hg porosimetry parameters and pressures between 203 and 231 MPa was found to generate reliable results for the maximum porosity measurement, with no dependence on other parameters. Since the Hg porosimetry, acid digestion, and optical microscopy methods provided porosity results with a statistically significant similarity, it can be concluded that all these methods are feasible for the analysis of voids. Finally, potential benefits of the proposed porosity analysis methodology were highlighted through the characterization of the void volume, position, and morphology. POLYM. ENG. SCI., 60:841–849, 2020. © 2020 Society of Plastics Engineers

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“…Nano-particles of Ni-Pc fulfill their objectives through the following functions: Reducing the porosity of PANI matrix by filling the empty spaces inside the coating matrix 41 . Increasing the tortuosity inside PANI matrix, leading to the hinder the movement of corrosive ions inside the PANI matrix 42 . Reducing the deformation of the PANI matrix, leading to the strong adhesion strength and good protective layer 43 .…”

Section: Resultsmentioning

confidence: 99%

Novel nanocomposites of Ni-Pc/polyaniline for the corrosion safety of the aluminum current collector in the Li-ion battery electrolyte

Deyab

Mele

Bloise

et al. 2021

Sci Rep

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In electrochemical energy storage systems, Li-ion batteries have drawn considerable interest. However, the corrosion of the aluminum current collector in the LiN(SO2CF3)2 electrolyte has a major effect on battery efficiency. To protect the current collector from the corrosive action of the LiN(SO2CF3)2 electrolyte, new nanocomposites based on Ni(II)tetrakis[4-(2,4-bis-(1,1-dimethyl-propyl)-phenoxy)]phthalocyanine (Ni-Pc) and polyaniline matrix (PANI) (i.e. PANI@Ni-Pc composites) are coated on the aluminum current. SEM, XRD, and EDS were used to characterize the PANI@Ni-Pc composite. This method represents a novel approach to the production of Li-ion batteries. Electrochemical tests show that the PANI@Ni-Pc composites can protect aluminum from corrosion in LiN(SO2CF3)2. The output of PANI@Ni-Pc composites is influenced by the Ni-Pc concentration. The composite PANI@Ni-Pc is a promising way forward to build high-stability Li-Ion batteries.

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Three-dimensional porosity characterization in carbon/glass fiber epoxy hybrid composites

Cited by 44 publications

References 30 publications

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Porosity Characterization of Carbon Fiber/Epoxy Composite Using Hg Porosimetry and Other Techniques

Novel nanocomposites of Ni-Pc/polyaniline for the corrosion safety of the aluminum current collector in the Li-ion battery electrolyte

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