A novel sound absorber foam based on ethylene propylene diene monomer (<scp>EPDM</scp>) to absorb low‐frequency waves: Influence of <scp>EPDM</scp> ethylene content

Hosseinpour, Ali; Katbab, Ali Asghar; Ohadi, Abdolreza

doi:10.1002/pen.26001

Cited by 9 publications

(12 citation statements)

References 62 publications

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“…⊍ max records an increase by 11% to 54% for samples having different AZD contents, while samples with different f-MWCNT contents record an increase from 31% to 58%, where ⊍ max for the sample C 7.5FA increased from 0.51 to 0.78 and for the sample A 3FA-CNTs-1 increased from 0.33 to 0.53. The maximum ⊍ max of 0.78 was observed for the C 7.5FA irradiated sample with thickness 10 mm which is comparable to an EPDM sample with an ⊍ max of 0.91 with thickness 20 mm fabricated by Hosseinpour et al 46 The improvement in sound absorption behavior might be attributed to the induced effect of scission, which shortens the polymer chains and improves the crosslinking. Mostly, the foam density, pore size and nanofiller position have a key role in its physical behavior.…”

Section: Crosslink Density Evaluationsupporting

confidence: 66%

Improvement of the acoustic and mechanical properties of sponge ethylene propylene diene rubber/carbon nanotube composites crosslinked by subsequent sulfur and electron beam irradiation

Eyssa

Afifi

Moustafa

2022

Polymer International

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In this research, sponge ethylene propylene diene rubber (EPDM) nanocomposites based on functionalized multi-walled carbon nanotubes (f-MWCNTs) and foaming agent azodicarbonamide (AZD) were successfully fabricated as potential acousticabsorbing foams. Two crosslinking systems were utilized for stabilizing the foam structure and improving its properties by subsequent sulfur and electron beam irradiation at 50 kGy as a fixed dose. The impacts of the concentration of AZD, f-MWCNTs and crosslinking systems on acoustic and physico-mechanical properties were investigated. The results manifested that the optimum foaming content was 3 phr. The acoustic data exhibited satisfactory enhancement in the sound absorption coefficient (⊍) for irradiated foam nanocomposites compared to unirradiated nanocomposites. This was attributed to the barrier effect of f-MWCNTs in reducing the pore size of the foam, leading to an increase in the tortuous path in the foam matrix that stifled the sound waves from transferring into the bulk. Likewise, the compression properties were also improved. However, tensile stress and strain at break values for irradiated foams relatively decreased. The data obtained revealed an excellent possibility of using these EPDM foam nanocomposites for potential applications such as acoustic panels and airborne sound insulation.

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Section: Crosslink Density Evaluationsupporting

confidence: 66%

Improvement of the acoustic and mechanical properties of sponge ethylene propylene diene rubber/carbon nanotube composites crosslinked by subsequent sulfur and electron beam irradiation

Eyssa

Afifi

Moustafa

2022

Polymer International

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“…Among various 3D porous networks, melamine foam (MF) is widely used as a sound-absorbing material due to its easy handling, facile introduction into a device, and high mechanical stability . Specifically, research is continuously being conducted to improve the absorption of sound frequency by introducing melamine surface changes of various scales (nanometers to micrometers), adjusting the porosity and curvature of the structure. − Losic et al introduced graphene oxide into the melamine skeleton to form a lamellar network structure, improving the sound absorption performance and mechanical stability of MF .…”

Section: Introductionmentioning

confidence: 99%

Conductive Three-Dimensional Lamella Network for Improved Sound Absorption and Heat Transfer

Phan

Roh

Lee

2023

ACS Appl. Polym. Mater.

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Recently, the quality of life of human has been increasingly threatened by noise caused by various surroundings. To prevent damage from noise, research is being conducted on materials that are capable of both blocking noise in a wide frequency range and transferring frictional heat generated from the noise blocking. In this study, using porous melamine foam (MF) as the basic material, a three-dimensional (3D) lamellar structure with excellent sound absorption and thermal conductivity was manufactured using the dipping process and vapor deposition polymerization, respectively. The 3D lamella structure shows excellent sound absorption performance in a wide frequency range of 250–6300 Hz, and in particular, has a sound absorption coefficient value of 0.96 at 4000 Hz. Due to the coating of the structure using polypyrrole as a conductive polymer, it has a higher thermal conductivity value (0.286 W m–1 K–1) than MF (0.033 W m–1 K–1). This structure also has high structural stability and elastic recovery performance, so it has the same mechanical performance, even after 500 repeated deformations.

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“…In addition, compared with the solid samples, polymeric foams have many distinctive characters, such as the low density, high impact strength, and good thermal and acoustic insulation. [3][4][5] Polyvinylidene fluoride (PVDF) is a polymeric plastic with many excellent benefits, such as corrosion resistance, oxidation resistance, flame retardancy, piezoelectric, and dielectric properties. These merits make it have been widely applied as the membrane material and electronic device, which also attracts people use it as the foaming material.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lightweight and tough PVDF foams via high‐pressure foam injection molding with core‐back operation

Weng

Ren

et al. 2022

Polymer Engineering & Sci

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Polyvinylidene fluoride (PVDF) foams prepared by batch foaming have been intensively studied, but it still remains a challenge to fabricate high‐performance PVDF foams for structural applications. Herein, by adding polymethyl methacrylate (PMMA) as the minor component, the blend foams were successfully fabricated using supercritical carbon dioxide (CO2) as a green blowing agent via foam injection molding (FIM) with core‐back operation. The added PMMA could reduce the crystal size of PVDF. Owing to fine cellular structure and small crystal sizes, the injection‐molded blend microcellular foams exhibited superior mechanical properties. Especially, the elongation at break and specific breaking energy of the blend foam with 40% void fraction were separately increased by 184% and 297% compared to that of the PVDF foam. These findings revealed that the lightweight microcellular PVDF foams with improved toughness could be manufactured by the scale‐up and efficient FIM technology, which showed a promising future in automotive and other structural applications.

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A novel sound absorber foam based on ethylene propylene diene monomer (EPDM) to absorb low‐frequency waves: Influence of EPDM ethylene content

Cited by 9 publications

References 62 publications

Improvement of the acoustic and mechanical properties of sponge ethylene propylene diene rubber/carbon nanotube composites crosslinked by subsequent sulfur and electron beam irradiation

Improvement of the acoustic and mechanical properties of sponge ethylene propylene diene rubber/carbon nanotube composites crosslinked by subsequent sulfur and electron beam irradiation

Conductive Three-Dimensional Lamella Network for Improved Sound Absorption and Heat Transfer

Lightweight and tough PVDF foams via high‐pressure foam injection molding with core‐back operation

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