Effects of chemical structure and morphology of graphene-related materials (GRMs) on melt processing and properties of GRM/polyamide-6 nanocomposites

Gómez, Julio; Villaro, Elvira; Karagiannidis, Panagiotis; Elmarakbi, Ahmed

doi:10.1016/j.rinma.2020.100105

Cited by 22 publications

(28 citation statements)

References 60 publications

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“…Polishing and smoothing are the major types of damage sustained by polymer surfaces during friction, and this occurs when soft and hard surfaces rub against each other. In the wear mechanism, the polymer is moved to a harder mating surface by the close contact of two materials, and thereafter, they are removed as abrasive debris [ 18 , 19 ]. As shown in Figure 7 b, the DR-10 sample has an uneven wear surface with large abrasive grains.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 8 b,c, flexural properties are greatly reduced in the samples (DH, DR) directly compounded with graphene powder. This decrease may have occurred because of the low attractive force between graphene and the polymer chain [ 18 , 19 ]. However, in the sample (S05) containing CMG prepared by self-adsorption, the flexural strength and flexural modulus were increased.…”

Section: Resultsmentioning

confidence: 99%

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Tribological Properties of Polyamide 46/Graphene Nanocomposites

Lee

Kim

et al. 2022

Polymers

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Polyamide 46 (PA46) is used in various automotive parts because of its excellent heat resistance and mechanical properties. This study aims to improve the frictional properties of PA46 using the lubricating ability of graphene. Nanocomposites are prepared via two mixing methods: Graphene powder is compounded directly with PA46 pellets through a twin-screw extruder, or PA46 powder is added to graphene dispersion for self-adsorption, and subsequently, it is dried and compounded with PA46 through the twin-screw extruder. Application of the nanocomposite in the friction field is evaluated via the pin-on-disk method. The coefficient of friction of the nanocomposite prepared by self-adsorption is lower than that of the nanocomposite prepared by direct compounding. The mechanical properties of the nanocomposite fabricated by self-adsorption are superior to those of other materials. This can be attributed to the uniform dispersion of graphene and the strong attractive force between the PA46 matrix and graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tribological Properties of Polyamide 46/Graphene Nanocomposites

Lee

Kim

et al. 2022

Polymers

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“…The 2°C smaller melting temperature of bound PA6 in RGO that associated with the nanocomposites and control polymer is probably a cause of the length of PA6 links grafted onto the RGO surface and is monitored to be owing to Gr hindering the link spread in PA6, causing in a smaller molecular weight [26]. The physical characteristics of crystalline polymers are directed by super-molecular morphology that consecutively is regulated by crystallization procedure [20,21]. Therefore, the research of crystallization performance is essential for creating structureproperty correlations in PA6-RGO nanocomposites.…”

Section: Results and Analysismentioning

confidence: 99%

“…Graphene (Gr), was interested owing to its interesting and incomparable physical characteristics [11][12][13]. Hence, Gr was underlined in assembling several micro-electrical tools [14], batteries [15], particularly in the area of conductive switching [16], bio-imaging [17], and photocatalysis [18], and one of the utmost intriguing features of Gr is the capacity for their usage in electronic purposes [19][20][21]. Gr was considered due to the very proficient thermal interface material, significant thermal regulator substance, and conductive alternate additive in nanocomposites, owing to its excellent thermal conductivity (k) and superior steadiness in elevated temperature [22].…”

Section: Introductionmentioning

confidence: 99%

The influence of reduced graphene oxide on the Polyamide 6 nanocomposite characteristics

Sabet

Hosseini

2022

Preprint

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Polyamide 6 (PA6) nanocomposites with electrically and thermally conductive were formulated via melt processing of PA6 and different inclusion of reduced graphene oxide (RGO). These nanocomposites showed that the small percolation threshold and the perfect formation of conductive link form with 0.5 wt% and ̴3.0 wt% of RGO respectively. Crystallization examination confirmed that RGO enabled the crystallization of PA6 structure mostly through speeding up the formation of crystal nucleus, reaching a maximum and smallest of crystal grain extent with RGO inclusion up to 2.0 wt% that approved the generation of the most unflawed crystalline matrix. With the dynamic rheological testing, frequency-independence of G’ and abruptly decrease phase angle at the small-frequency area via RGO content of 2.0 wt% specify the alteration state from liquid-state to solid-state rheological performance, and validate the development of percolation link structure with RGO in the function of a crosslinking factor. The progress of fire-retardant characteristics of PA6 was attained due to the inclusion of RGO owing to the improver in the PA6 structure. Morphological research showed that RGO was spread consistently in the PA6 structure. From the outcomes of cone calorimetry outcomes, the flame-retardant characteristics of PA6 were promoted with the addition of RGO in the PA6 structure. These tests show substantial capacity for the bulk manufacture of electrically conductive polymer/RGO nanocomposites.

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“…Differences were noticed not only in the case of morphology, but also dimensions, as for multilayer graphene the lateral size was about 5 nm, while for single flakes it was less than half of this value. In work ( Gomez et al, 2020 ) authors also observed wrinkled structure for graphene oxide and reduced graphene oxide with the thickness in the range of 1 nm. The lateral size however was substantially bigger, and as they found out, it was about 20–30 μm for both GO and RGO.…”

Section: Bioactivity and Toxicity Of Gfmsmentioning

confidence: 90%

A Review on Development of Ceramic-Graphene Based Nanohybrid Composite Systems in Biological Applications

Jakubczak

Jastrzębska

2021

Front. Chem.

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Graphene-based nanocomposites constitute an interesting and promising material for various applications. Intensive progress in the development of this group of materials offers an opportunity to create new systems useful for drinking water decontamination or other biotechnological applications. Nanohybrid structures of graphene-ceramic systems can be obtained using covalent graphene surface modification with nanoparticles (NPs) of ceramic and/or co-deposition of metals with selected morphology and chemistry. The present paper systematizes the associated bio-related knowledge and inspires future development of graphene/NPs systems. Emerging knowledge and unique research techniques are reviewed within designing the required nanocomposite structure and chemical composition, development and optimization of new methods of covalent surface modification of graphene with NPs as well as analysis of mechanisms governing the formation of covalent bonding. Further, innovative research tools and methodologies are presented regarding the adjustment of functionalities of materials used for the application in drinking water decontamination or biocidal composites. This study provides a comprehensive base for rational development of more complex, hybrid graphene-based nanomaterials with various bio-functionalities that can be further applied in industrial practice.

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Effects of chemical structure and morphology of graphene-related materials (GRMs) on melt processing and properties of GRM/polyamide-6 nanocomposites

Abstract: Effects of chemical structure and morphology of graphene-related materials (GRMs) on melt processing and properties of GRM/polyamide-6 nanocomposites. Results in Materials, 7. p. 100105.

Cited by 22 publications

References 60 publications

Tribological Properties of Polyamide 46/Graphene Nanocomposites

Tribological Properties of Polyamide 46/Graphene Nanocomposites

The influence of reduced graphene oxide on the Polyamide 6 nanocomposite characteristics

A Review on Development of Ceramic-Graphene Based Nanohybrid Composite Systems in Biological Applications

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