Acoustical performance of porous absorber made from recycled rubber and polyurethane resin

Maderuelo-Sanz, Rubén; Morillas, Juan Miguel Barrigón; Castizo, Manuel Martín; Escobar, Valentı́n Gómez; Gozalo, Guillermo Rey

doi:10.1590/s1679-78252013000300008

Cited by 50 publications

(23 citation statements)

References 23 publications

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“…3. The trends of SAC were in consistent with the findings from Maderuelo- Sanz et al (2013) when the acoustical performance of the rubber and polyurethane resin composite were examined. Figure 4a shows that the average sound absorption coefficient (ASAC) of both WPUF and RPUF had similar changes as the fiber content increased from 0 to 20 php, which initially increased and then decreased from 0 to 2000 Hz.…”

Section: Morphologysupporting

confidence: 83%

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Effect of Fiber Content on Sound Absorption, Thermal Conductivity, and Compression Strength of Straw Fiber-filled Rigid Polyurethane Foams

Tao¹,

Li²,

Cai³

2016

BioResources

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Rigid polyurethane (PUR) foam is one of the most important insulating materials used today in the construction industry and is the main insulation material used in the global appliances industry. This study developed rice straw fiber-filled PUF (RPUF) and wheat straw fiber-filled PUF (WPUF) and explored the morphology, sound absorption properties, heat transfer, and compressive strength of the PUF composites. The results indicated that, with the higher fiber content, more open cells were observed in SEM images of the composites. The average sound absorption coefficients (ASAC) of both WPUF and RPUF were significantly increased when 5 per hundred polyols (php) by weight and 10 php fiber contents were added. When fiber contents of 15 php and 20 php were utilized, ASAC reduced due to the tortuosity of cells and large holes in the foam. The sound absorption coefficient (SAC) first increased, then decreased, and increased finally as the sound frequency increased from 100 to 2000 Hz for the two composites. The thermal conductivities of both WPUF and RPUF first decreased and then increased as the fiber content increased from 0 to 20 php. When 5 and 10 php straw contents was added, the thermal conductivities were reduced by 25% to 50% compared to that of the pure PU form (0 php), indicating that the improved thermal insulation ability was obtained. The composite compressive strength was reduced by 19% to 28% due to the fiber addition.

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Section: Morphologysupporting

confidence: 83%

“…The acoustic absorption behavior of a porous material depends on the porosity, the tortuosity, and the flow resistivity (Maderuelo-Sanz et al 2013). The addition of straw fibers damaged the closed cell structures, resulting in an increase in SAC by opening cell structures of PUF.…”

Section: Effect Of Fiber Content On Sound Absorption Propertiesmentioning

confidence: 99%

Effect of Fiber Content on Sound Absorption, Thermal Conductivity, and Compression Strength of Straw Fiber-filled Rigid Polyurethane Foams

Tao¹,

Li²,

Cai³

2016

BioResources

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“…In recent years, researchers like [2][3][4] started working on the fabrication of fiber composites with the combination of plastic and rubber based granular materials. The incorporation of granular materials such as rubber crumb increases the bulk density and flow resistivity of the composite material, which has a significant effect in enhancing low frequency acoustic absorption.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Absorption of Natural Fiber Composites

Mamtaz

Fouladi

Al-Atabi

et al. 2016

Journal of Engineering

132

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The current study is a bibliographic observation on prevailing tendencies in the development of acoustic absorption by natural fiber composites. Despite having less detrimental environmental effects and thorough availability, natural fibers are still unsuitable for wide implementation in industrial purposes. Some shortcomings such as the presence of moisture contents, thicker diameter, and lower antifungus quality hold up the progress of natural fiber composites in staying competitive with synthetic composites. The review indicates the importance of the pretreatment of fresh natural fiber to overcome these shortcomings. However, the pretreatment of natural fiber causes the removal of moisture contents which results in the decrease of its acoustic absorption performance. Incorporation of granular materials in treated fiber composite is expected to play a significant role as a replacement for moisture contents. This review aims to investigate the acoustic absorption behavior of natural fiber composites due to the incorporation of granular materials. It is intended that this review will provide an overview of the analytical approaches for the modeling of acoustic wave propagation through the natural fiber composites. The possible influential factors of fibers and grains were described in this study for the enhancement of low frequency acoustic absorption of the composites.

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“…The composites with 30 wt% in fiber was characterized by an acoustic absorption improvement of about 40%. We can conclude that at higher fiber content the porosity is greater wich gives better sound absorption coefficient [62][63][64] but tensile properties drop drastically, that suggests the 20% content of alkali fiber as optimum content.…”

Section: Acoustic Propertiesmentioning

confidence: 85%

Alfa fiber-polyurethane composite as a thermal and acoustic insulation material for building applications

et al. 2019

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The aim of the present work pointed out the introduction of natural alkalised alpha fibres as reinforcement in the preparation of partially biodegradable green insulation material composite. Thermal conductivity, mechanical properties and acoustical performances of composites were investigated as a function of fibre content. We found that 10% of alkali solution improve the hydrophobic character, mechanical and interfacial properties of the fibers. Composites made of alfa fibers-polyurethane resin has exhibited good mechanical and acoustical properties. At 20% of reinforcement the Young modulus and tensile stress increased by 48.14% and 74.12%, respectively.

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Acoustical performance of porous absorber made from recycled rubber and polyurethane resin

Cited by 50 publications

References 23 publications

Effect of Fiber Content on Sound Absorption, Thermal Conductivity, and Compression Strength of Straw Fiber-filled Rigid Polyurethane Foams

Effect of Fiber Content on Sound Absorption, Thermal Conductivity, and Compression Strength of Straw Fiber-filled Rigid Polyurethane Foams

Acoustic Absorption of Natural Fiber Composites

Alfa fiber-polyurethane composite as a thermal and acoustic insulation material for building applications

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