Prediction of acoustic properties of polyurethane foams from the macroscopic numerical simulation of foaming process

Abdessalam, Hichem; Abbès, Boussad; Abbès, Fazilay; Li, Yuming; Guo, Ying

doi:10.1016/j.apacoust.2017.01.021

Cited by 17 publications

(15 citation statements)

References 29 publications

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“…The gelling process is continuously gone through the polymerization reaction, and the blowing process is also continued until no more water remained for reaction in the mixture . The extent of blowing reaction for CO 2 generation is crucial in forming a cavity and interconnecting pores, and the cell morphology is a very important characteristic to analyze the sound absorption property.…”

Section: Resultsmentioning

confidence: 99%

“…Sound waves can be transmitted, reflected, scattered, and/or absorbed while they hit the surface of cell walls and struts in FPUFs …”

Section: Resultsmentioning

confidence: 99%

“…When sound waves hit the hard domains containing HS crystals and hydrogen bonding, they will start to vibrate and oscillate like a spring; so, they make the other attached SSs and side groups to vibrate and dissipate the applied mechanical energy. It can be concluded that HASC and microphase separation which control flexibility, toughness, elasticity, and also viscose behavior of PUFs, possess a significant role in the sound absorption mechanism . In addition, open‐cell content of each FPUFs was calculated and listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…PUFs are solid–gas composites which could be categorized into open and closed or into the flexible and rigid foams according to their cells structure and stiffness, respectively . Flexible polyurethane foams (FPUFs) with viscoelastic behavior and a high volume of interconnecting pores and open cells are the best acoustic damping materials until now .…”

Section: Introductionmentioning

confidence: 99%

“…The sound absorption performance can be assessed by the sound absorption coefficient (α) which depends on the both solid‐phase attributes and cellular morphology of foams including macroscopic density, tortuosity, thickness of cell walls and struts, airflow resistivity, porosity, average cell size, and cell size distribution …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Baghban

Khorasani

Sadeghi

2018

J of Applied Polymer Sci

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High-efficiency sound absorbing flexible polyurethane foams (FPUFs) are manufactured using nonpolar polyester resin, methylene diphenyl diisocyanate, and other reagents by one-shot bulk polymerization. In this study, the impact of the isocyanate index (90, 100, and 110) and water content (2.5 and 5%) on the microphase separation and soundproofing behavior of FPUFs are examined using atomic force microscopy, Fourier transform infrared spectroscopy, optical microscope, and an impedance tube device. The results reveal that the increase of the isocyanate index and water content leads to the increase of the cell size, cell size distribution, open-cell content, cell wall roughness, and microphase separation. Also, maximum sound absorption coefficient (α) reaches to 0.98 and the average of α in the frequency range of 1500-4000 Hz increases from 0.7 to 0.87 by increasing the water content from 2.5 to 5% and isocyanate index from 90 to 110; therefore, acoustic damping performance enhances up to 26.24% due to the synergic effects of microphase separation on the viscose media formation, open-cell content, cell wall roughness, cell size, and cell size distribution. In conclusion, FPUFs with an optimal amount of microphase separation and drainage flow can be a promising candidate for sound insulating materials.

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Section: Resultsmentioning

confidence: 99%

“…Sound waves can be transmitted, reflected, scattered, and/or absorbed while they hit the surface of cell walls and struts in FPUFs …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Baghban

Khorasani

Sadeghi

2018

J of Applied Polymer Sci

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Soundproofing flexible polyurethane foams: The impact of polyester chemical structure on the microphase separation and acoustic damping

Baghban

Khorasani

Sadeghi

2018

J of Applied Polymer Sci

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High‐performance acoustic‐damping flexible polyurethane foams (FPUFs) were fabricated using synthesized linear saturated aliphatic polyesters, methylene diphenyl diisocyanate, and other reagents by one‐shot bulk polymerization (isocyanate index = 110 and water content = 5%). In this study, the effect of the chemical structure of different LSAPs on microphase separation and acoustic dampening behavior of FPUFs was investigated using atomic force microscopy, Fourier transform infrared spectroscopy, compressive strength, optical microscopy, and an impedance tube device. The results revealed that by increasing the microphase separation, sound absorption efficiency increased up to 45%. Also, by increasing microphase separation, compressive strength, open‐cell contents, roughness, and cell size distribution of FPUFs increased, and the average cell size decreased. Sound wave energy dissipation of FPUFs can be explained by the synergistic actions of the microphase separation including the viscoelastic behavior of segments and increasing of drainage flow pathway. Finally, the results revealed that soundproofing FPUFs under optimum conditions for microphase separation and drainage flow can be promising candidates for use as sound‐insulating materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46744.

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The Influence of Microstructure on Sound Absorption of Polyurethane Foams through Numerical Simulation

Chen

Shuai

Zhu

et al. 2021

Macro Theory & Simulations

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It exists an unchanging requirement in modern society to achieve an ideal fuel economy using light acoustic packaging with good sound absorption performance. The Polyurethane (PU) foam with excellent damping properties usually has the characteristics of low mass and low density. Therefore, it is often considered as an ideal sound‐absorbing packaging material. With the further research on the PU foam, we have learned that the inherent microstructure of the PU foam has a special effect on its sound absorption performance. In this paper, the authors theoretically demonstrate the effect of cell size, connectivity and relative pore diameter on sound absorption performance by numerical simulation analysis. From the numerical simulation analysis, the results show that the three cellular structure factors have different effects on the parameters of the Johnson‐Champoux‐Allard (JCA) acoustic model, and all of them can improve the sound absorption coefficient of PU foam. Additionally, the further analysis indicates that the relative pore diameter is the most vital factor to improve the sound absorption performance in the entire frequency domain. This research could be applied to industrial production to reduce the amount of acoustic packaging material used in vehicles while improving the acoustic quality of vehicles.

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Prediction of acoustic properties of polyurethane foams from the macroscopic numerical simulation of foaming process

Cited by 17 publications

References 29 publications

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

Soundproofing flexible polyurethane foams: The impact of polyester chemical structure on the microphase separation and acoustic damping

The Influence of Microstructure on Sound Absorption of Polyurethane Foams through Numerical Simulation

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