Evaluation of the acoustic performance of polyurethane foams embedded with rock wool fibers at low-frequency range; design and construction

Mohammadi, Behzad; Safaiyan, Abdolrasoul; Habibi, Peymaneh; Moradi, Gholamreza

doi:10.1016/j.apacoust.2021.108223

Cited by 14 publications

(9 citation statements)

References 30 publications

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“…The commercial materials that were selected for the comparison were fiberglass, polyurethane foam, and drywall (in Mexico the commercial name of this material is TablarocaⓇ), indeed these materials have high acoustic absorption properties and are frequently used in the construction of housing. 30,32 Table 3 presents the physical parameters of each characterized sample, calculated following the procedures described in the experiment section. All samples were prepared with a diameter of 1.61 cm, a thickness between 1 and 2.5 cm, and the weight and density depending on the compositions of each material.…”

Section: Resultsmentioning

confidence: 99%

Acoustic properties of composites materials based on bentonite and coconut or cactus (nopal) fibers

Martínez

Loera‐Serna

Vázquez-Cerón

2023

Journal of Composite Materials

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Materials made from natural fibers or waste have been studied to acquire a composite with good acoustical isolation properties, commercial materials used in this concern are polyurethane foam, fiberglass, Rockwool, and drywall. This work proposes using waste coconut and cactus ( Opuntia ficus-indica) fibers to synthesize bentonite composites and study their physicochemical and acoustic properties. Physicochemical properties of precursor and composites (75% wt. fiber) were determined by XRD, FTIR, N2 adsorption, optical, and SEM microscopies. The transmission, reflection, and absorption coefficients, 50 to 10,000 Hz, were obtained in an impedance tube and were compared with commercial materials. The composites were subjected to surface humidity and thermal (30, 50, and 70°C) tests to evaluate the stability of acoustic properties. The mechanical properties of the composites are improved with the addition of bentonite, hardness is increased by 6.7% and 0.9%, and the density is decreased by 73.6% and 45.5%, for coconut and nopal, respectively, porosity also changes. We corroborated the significant presence of montmorillonite in bentonite (XRD), while the nopal or coconut fibers are composed of hemicellulose, cellulose, and lignin (FTIR). Also, mucilage was identified in the nopal samples as adherent biopolymer that generates stability either thermally or in wetting conditions. Coconut fiber has a high absorption coefficient (similar to polyurethane), which is reduced with humidity. However, by adding bentonite, the reflection is more elevated, and transmission is lower than commercial materials. The bentonite and nopal (fiber and composite) presented stability in the acoustic coefficients as a function of humidity and temperature.

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Section: Resultsmentioning

confidence: 99%

Acoustic properties of composites materials based on bentonite and coconut or cactus (nopal) fibers

Martínez

Loera‐Serna

Vázquez-Cerón

2023

Journal of Composite Materials

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“…The SA properties were enhanced to a greater extent when the fabricated PU composite foam was used than the standard polyurethane foam. [ 16 ] To improve the acoustic qualities of pure PU foams, PU foam composites were created by adding MWCNT, silica, bamboo nanoparticles, etc. to PU foam at various weight percentages.…”

Section: Introductionmentioning

confidence: 99%

Experimentation, simulation, and statistical analysis of nanofillers reinforced bio‐based polyurethane foam for acoustical applications

Selvaraj

Subramanian

2023

Polymer Engineering & Sci

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This research aims to develop bio‐based polyurethane foam (PU) with nanofillers to absorb sound energy across a broad frequency range and compare experimental results to those from simulation and optimization. PVDF (Polyvinylidene fluoride), MgO (Magnesium oxide), and Ni (Nickel) nanofillers were incorporated into bio‐based PU through absorption and hydrothermal reduction technique, which includes mechanical stirring, compressing, heating, and evaporating. To determine the weight percentages of nanofillers, the design of the experimental approach was utilized. As per ASTM standard E 1050‐12, the bio‐based PU foam composite's sound absorption coefficient (SAC) was assessed using an impedance tube setup. Response Surface Methodology was utilized to estimate optimum sample weight percentages using a central composite design (CCD) with weight percentages of the three nanofillers as input and the noise reduction coefficient (NRC) as response output. According to the CCD results, the combination of 15 wt% PVDF, 10 wt% MgO, and 5 wt% Ni shows the highest NRC value of 0.66. Then, a confirmation sample was prepared, and the NRC was calculated. The NRC achieved for the confirmation sample was 0.62. SAC simulation results are contrasted with experimental data using COMSOL Multiphysics 5.5. The confirmation sample's average sound pressure level (SPL) reduction ranges from 2 to 29 dB, according to the SPL plot. The conclusion shows that bio‐based composite foam may be an excellent material for absorbing sound in vehicles and aircraft and reducing industrial noise.

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“…Mohammadi et al embedded 0–3 wt% of RWF in PU foam for better acoustic and mechanical properties. Compared to pure PU foam, PUF/RWF composites demonstrated significantly higher acoustic and mechanical properties [ 20 ]. Zhang et al evaluated how the presence of multiwalled carbon nanotube (MWNT) affected the properties of PU foam.…”

Section: Introductionmentioning

confidence: 99%

Combing High-Modulus Fibers with a Novel Foaming Structure Applied to Protective Sandwich-Structured Composites: Manufacturing Techniques and Property Evaluations

Lin

et al. 2023

Polymers

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This study proposes the composites with a sandwich structure that is primarily made by the multi-step foaming process. The staple material is polyurethane (PU) foam that is combined with carbon fibers, followed by a Kevlar woven fabric. The composites are evaluated in terms of puncture resistance, buffer absorption, and electromagnetic wave shielding effectiveness (EMSE). The manufacturing process provides the composites with a stabilized structure efficiently. Serving the interlayer, a Kevlar woven fabric are sealed between a top and a bottom layer consisting of both PU foam and an aluminum film in order, thereby forming five-layered composites. Namely, the upper and lower surfaces of the five-layered sandwiches are aluminum films which is laminated on a purpose for the EMSE reinforcement. The test results indicate that the PU foam composites are well bonded and thus acquire multiple functions from the constituent materials, including buffer absorption, puncture resistance, and EMSE. There is much prospect that the PU foam composites can be used as a protective material in diverse fields owing to a flexible range of functions.

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Evaluation of the acoustic performance of polyurethane foams embedded with rock wool fibers at low-frequency range; design and construction

Cited by 14 publications

References 30 publications

Acoustic properties of composites materials based on bentonite and coconut or cactus (nopal) fibers

Acoustic properties of composites materials based on bentonite and coconut or cactus (nopal) fibers

Experimentation, simulation, and statistical analysis of nanofillers reinforced bio‐based polyurethane foam for acoustical applications

Combing High-Modulus Fibers with a Novel Foaming Structure Applied to Protective Sandwich-Structured Composites: Manufacturing Techniques and Property Evaluations

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