Development of functionalised foam for electrostatic discharge applications

Silva, Cátia Samanta Ribeiro; Lima, André; Rodrigues, Sérgio J.; Gonçalves, Luis F.F.F.; Sampaio, Álvaro M.; Oliveira, Luís; Fernandes, André; Pontes, A. J.

doi:10.1080/14658011.2020.1809232

Cited by 8 publications

(3 citation statements)

References 14 publications

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“…10 5 ≤ surface resistance > 10 11 Ω), proving its suitability for applications where it is necessary to ensure protection against electrostatic fields (e.g. manufacturing of enclosures or jigs for the automotive electronics industry) (Silva et al , 2020). In both materials, the electrical conductivity gradually increased to 10 −6 S/cm, surpassing the insulating range of the base polymeric matrix (Le et al , 2017).…”

Section: Resultsmentioning

confidence: 99%

Development and characterization of composite materials with multi-walled carbon nanotubes and graphene nanoplatelets for powder bed fusion

Lopes,

Sampaio,

Pontes

2023

RPJ

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Purpose With the technological progress, high-performance materials are emerging in the market of additive manufacturing to comply with the advanced requirements demanded for technical applications. In selective laser sintering (SLS), innovative powder materials integrating conductive reinforcements are attracting much interest within academic and industrial communities as promising alternatives to common engineering thermoplastics. However, the practical implementation of functional materials is limited by the extensive list of conditions required for a successful laser-sintering process, related to the morphology, powder size and shape, heat resistance, melt viscosity and others. The purpose of this study is to explore composite materials of polyamide 12 (PA12) incorporating multi-walled carbon nanotubes (MWCNT) and graphene nanoplatelets (GNP), aiming to understand their suitability for advanced SLS applications. Design/methodology/approach PA12-MWCNT and PA12-GNP materials were blended through a pre-optimized process of mechanical mixing with various percentages of reinforcement between 0.50 wt.% and 3.00 wt.% and processed by SLS with appropriate volume energy density. Several test specimens were produced and characterized with regard to processability, thermal, mechanical, electrical and morphological properties. Finally, a comparative analysis of the performance of both carbon-based materials was performed. Findings The results of this research demonstrated easier processability and higher tensile strength and impact resistance for composites incorporating MWCNT but higher tensile elastic modulus, compressive strength and microstructural homogeneity for GNP-based materials. Despite the decrease in mechanical properties, valuable results of electrical conductivity were obtained with both carbon solutions until 10–6 S/cm. Originality/value The carbon-based composites developed in this research allow for the expansion of the applicability of laser-sintered parts to advanced fields, including electronics-related industries that require functional materials capable of protecting sensitive devices against electrostatic discharge.

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Section: Resultsmentioning

confidence: 99%

Development and characterization of composite materials with multi-walled carbon nanotubes and graphene nanoplatelets for powder bed fusion

Lopes,

Sampaio,

Pontes

2023

RPJ

Self Cite

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“…The non-reactive reagents were removed by washing the solid foam with distilled water followed by drying at 70 °C for 24 h. The gel time, related to the interval in which the liquid foam transforms to gel during the gelling process, was recorded for all NRLF preparations. Gel time measurements were conducted in glass cups (600 mL) and performed using ASTM D 7487–18 methodology with slight modifications from earlier reports [5] , [30] , [31] . Although this method is developed for PU molded foam, the physical process of waiting for the gel appearance between PU molded foam and NRLF is somewhat similar.…”

Section: Methodsmentioning

confidence: 99%

Ultrasonic-assisted Dunlop method for natural rubber latex foam production: Effects of irradiation time on morphology and physico-mechanical properties of the foam

Sukkaneewat

Utara

2022

Ultrasonics Sonochemistry

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Highlights Ultrasonication is incorporated with the Dunlop method as a novel alternative technique for producing natural rubber latex foam. Ultrasonic irradiation effects on the properties of flexible elastomeric foam formed via liquid–solid state transformation in an aqueous media are first reported. The introduced ultrasonic process causes no delays or interruptions in the production of natural rubber latex foam. An optimal ultrasonication period promotes homogeneous nucleation and endothermic dissipation processes, which improved the foam's morphology and physico-mechanical properties.

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“…However, at the same time, the production and use of a large number of waste products are one of the main sources of pollutants [ 16 ]; thus, dealing with a large amount of waste polyurethane has become a top priority. The physical treatment destroys the chemical structure of polyurethane to a certain extent [ 17 , 18 , 19 ], leading to a decline in the performance of the regenerated product. Biological treatment is time-consuming and inefficient, and alcoholysis is the most feasible method for chemical treatment [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Efficient Degradation of Waste PU Foam

et al. 2023

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In this paper, the high-efficiency degradation and alcoholysis recovery of waste polyurethane foam were realized using a combination of a high-efficiency alkali metal catalyst (CsOH) and two-component mixed alcoholysis agents (glycerol and butanediol) in different proportions, using recycled polyether polyol and one-step foaming to prepare regenerated thermosetting polyurethane hard foam. The foaming agent and catalyst were adjusted experimentally to prepare regenerated polyurethane foam, and a series of tests were conducted on the viscosity, GPC, hydroxyl value, infrared spectrum, foaming time, apparent density, compressive strength, and other properties of the degradation products of the regenerated thermosetting polyurethane rigid foam. The resulting data were analyzed, and the following conclusions were drawn: The optimal conditions of alcoholysis were obtained when the mass ratio of glycerol to butanediol was 3:2, the amount of cesium hydroxide was 0.08%, the reaction temperature was 170 °C, and the reaction time was 2.5 h. Regenerated polyurethane foam with an apparent density of 34.1 kg/m3 and a compressive strength of 0.301 MPa was prepared under these conditions. It had good thermal stability, complete sample pores, and a strong skeleton. At this time, these are the best reaction conditions for the alcoholysis of waste polyurethane foam, and the regenerated polyurethane foam meets various national standards.

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Development of functionalised foam for electrostatic discharge applications

Cited by 8 publications

References 14 publications

Development and characterization of composite materials with multi-walled carbon nanotubes and graphene nanoplatelets for powder bed fusion

Development and characterization of composite materials with multi-walled carbon nanotubes and graphene nanoplatelets for powder bed fusion

Ultrasonic-assisted Dunlop method for natural rubber latex foam production: Effects of irradiation time on morphology and physico-mechanical properties of the foam

Study on Efficient Degradation of Waste PU Foam

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