Mechanical and sound absorption properties of open-cell polyurethane foams modiﬁed with rock wool fiber

Mohammadi, Behzad; Ershad‐Langroudi, Amir; Moradi, Gholamreza; Safaiyan, Abdolrasoul; Habibi, Peymaneh

doi:10.1016/j.jobe.2021.103872

Cited by 10 publications

(11 citation statements)

References 68 publications

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“…Also, the HCMF sound absorbent composites that are composed of a greater amount of HCM are proved to exhibit higher sound absorption coefficients at high frequencies. Therefore, the incorporation of HCM as the filler for PU foam is effective in improving the sound absorptivity of composites in this study, exemplifying a synergistic mechanism [ 13 , 14 , 15 , 18 , 25 , 31 ]. Similarly, Sung et al studied the difference in the sound absorptivity of PU foam, which was found to be dependent on the addition of hollow ceramic microspheres, as well as the resulting structural resonance.…”

Section: Resultsmentioning

confidence: 96%

“…Moreover, Sung et al reported that when used as a filler, hydroxide could change the cell structure, strengthening the sound absorptivity of materials at different frequencies [ 11 ]. There have been scholars using different fillers to change the properties of the composites in recent years [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. To summarize, either a change in chemical structure of materials or a reinforcement of fillers can provide PU foam with a synergistic effect, and the methods previously described are proved to be effective in attaining the functions as expected.…”

Section: Introductionmentioning

confidence: 99%

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Functional Hollow Ceramic Microsphere/Flexible Polyurethane Foam Composites with a Cell Structure: Mechanical Property and Sound Absorptivity

et al. 2022

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Noise pollution is the primary environmental issue that is increasingly deteriorated with the progress of modern industry and transportation; hence, the purpose of this study is to create flexible PU foam with mechanical properties and sound absorption. In this study, hollow ceramic microsphere (HCM) is used as the filler of polyurethane (PU) foam for mechanical reinforcement. The sound absorption efficacy of PU pores and the hollow attribute of HCM contribute to a synergistic sound absorption effect. HCM-filled PU foam is evaluated in terms of surface characteristic, mechanical properties, and sound absorption as related to the HCM content, determining the optimal functional flexible PU foam. The test results indicate that the presence of HCM strengthens the stability of the cell structure significantly. In addition, the synergistic effect can be proven by a 2.24 times greater mechanical strength and better sound absorption. Specifically, with more HCM, the flexible PU foam exhibits significantly improved sound absorption in high frequencies, suggesting that this study successfully generates functional PU foam with high mechanical properties and high sound absorption.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Functional Hollow Ceramic Microsphere/Flexible Polyurethane Foam Composites with a Cell Structure: Mechanical Property and Sound Absorptivity

et al. 2022

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“…In the study of Mohammadi et al., Which was performed to evaluate the sound absorption properties of open-cell polyurethane foams modified with rock wool fibers, the highest sound absorption efficiency for the modified absorber was in the range between 500 and 4800 Hz, While the absorption coefficient did not improve significantly at frequencies above 4800 Hz [ 21 ]. In the present study, the highest sound absorption was observed in the presence of rock wool, polyurethane foam, and air layer at frequencies of 500–3000 Hz.…”

Section: Discussionmentioning

confidence: 99%

The noise absorption prediction of a combined and independent absorber under different conditions and at different frequencies, using the new Engineering Noise Control Software (ENC)

malekabad

Ravandi²,

Ahmadi³

et al. 2022

Heliyon

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“…21−23 As a result of the high porosity and interpenetration of foams, incident sound waves can easily and effectively enter the inner spaces of the foam body, leading to the weakening of surface reflection and the high sound absorption coefficient (α) of foams at medium and high frequencies. 24,25 Therefore, the adjustment of opening degree plays an important part in improving sound absorption performance. 26 Researchers have made some attempts at adjusting and controlling the opening degree of polymer foam.…”

Section: Introductionmentioning

confidence: 99%

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

Ren,

Wang,

Sun

et al. 2023

ACS Appl. Polym. Mater.

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The open-cell foam is a highly preferred soundabsorbing material used for improving indoor sound quality. Herein, polyimide foam (PIF) with an open-cell structure was synthesized through the introduction of oxalic acid dihydrate (H 2 C 2 O 4 •2H 2 O). The introduction and subsequent decomposition of H 2 C 2 O 4 •2H 2 O provided additional heterogeneous nucleation sites during foaming and promoted the formation of open-cell structures. The relation between H 2 C 2 O 4 •2H 2 O content and pore structure, the formation mechanism of open-cell structures, and the effect of H 2 C 2 O 4 •2H 2 O content on the sound absorption performance were analyzed. Furthermore, interpenetrating-phase thermoplastic polyurethane (TPU)/PIF composites were prepared via non-solvent-induced phase separation on the basis of the open-cell PIF. The formation of porous TPU microstructures and improvement of mechanical and acoustic properties of the interpenetrating-phase composites were discussed. Two main forms of TPU existed in the interpenetrating composites: microparticle TPU structure and microporous TPU structure. The compression strength (125.54 kPa) and sound insulation capacity of 10%TPU/PIF3 were 3.47 and approximately 5 times those of open-cell PIF3, respectively. Moreover, the average sound absorption coefficient (1000−6400 Hz) increased by 58.43% compared to that of opencell PIF3. The design based on the open-cell PIF promoted the enrichment of internal channels, and the construction of the internal channels with porous TPU microstructures achieved reflection enhancement and viscoelastic damping dissipation. Finally, the combined effects of the two designs synchronously enhanced the mechanical properties, sound absorption, and sound insulation properties of TPU/PIF materials, providing a thought for improving the acoustic properties of serialized polymer foam materials.

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Mechanical and sound absorption properties of open-cell polyurethane foams modiﬁed with rock wool fiber

Cited by 10 publications

References 68 publications

Functional Hollow Ceramic Microsphere/Flexible Polyurethane Foam Composites with a Cell Structure: Mechanical Property and Sound Absorptivity

Functional Hollow Ceramic Microsphere/Flexible Polyurethane Foam Composites with a Cell Structure: Mechanical Property and Sound Absorptivity

The noise absorption prediction of a combined and independent absorber under different conditions and at different frequencies, using the new Engineering Noise Control Software (ENC)

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

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