Cell openness manipulation of low density polyurethane foam for efficient sound absorption

Park, Juhyuk; Minn, Kyung Suh; Lee, Hyeongrae; Yang, Sei Hyun; Yu, Cheng Bin; Pak, Seong Yeol; Oh, Chi Sung; Song, Young Seok; Kang, Yeon June; Youn, Jae Ryoun

doi:10.1016/j.jsv.2017.06.021

Cited by 91 publications

(28 citation statements)

References 58 publications

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“…In order to eliminate the influence of the higher apparent density on the mechanical properties of the foams, the normalized compressive strength was determined according to the equation of Hawkins [ 31 ]. The mechanical properties were normalized to the average PUR foam apparent density ( ρ norm ) for the foams with TEP and without TEP, 19 and 22 kg/m 3 respectively.…”

Section: Resultsmentioning

confidence: 99%

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Kurańska

Barczewski

et al. 2020

Materials

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The main goal of this work was to evaluate the thermal insulation and sound absorption properties of open-cell rigid polyurethane foams synthesized with different contents of cooking oil-based polyol. The content of the applied bio-polyol as well as flame retardant (triethyl phosphate) in the foam formulation had a significant influence on the cellular structures of the materials. The open-cell polyurethane foams were characterized by apparent densities in the range 16–30 kg/m3. The sound absorption coefficients of the polyurethanes with various contents of bio-polyol were determined using the standing wave method (Kundt’s tube) in the frequency range of 100–6300 Hz. The effect of the content of the bio-polyol and flame retardant on the coefficient of thermal conductivity (at average temperatures of 0, 10 and 20 °C) as well as the compressive strength (at 20 and −10 °C) was analyzed. Different trends were observed in terms of the thermal insulation properties and sound absorption ability of the open-cell polyurethanes due to the addition of bio-polyol. In conclusion, it is necessary to use systems containing both petrochemical and bio-based raw materials.

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Section: Resultsmentioning

confidence: 99%

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Kurańska

Barczewski

et al. 2020

Materials

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“…Polymer foams are classified into three categories based on density. If the density of a polymer foam is less than 0.1 g/m 3 , the polymer foam is considered high-foaming, with examples such as high-foaming polyethylene (PE) and PP foams [37,38,39]. If the density of a polymer foam is 0.1–0.4 g/m 3 , the polymer foam is considered medium-foaming, with medium-foaming PI foam serving as an example [40].…”

Section: Polymer Foaming and Processingmentioning

confidence: 99%

Recent Trends of Foaming in Polymer Processing: A Review

et al. 2019

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Polymer foams have low density, good heat insulation, good sound insulation effects, high specific strength, and high corrosion resistance, and are widely used in civil and industrial applications. In this paper, the classification of polymer foams, principles of the foaming process, types of blowing agents, and raw materials of polymer foams are reviewed. The research progress of various foaming methods and the current problems and possible solutions are discussed in detail.

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“…Due to their light weight and high porosity, porous materials received much attention in the twentieth century [5]. Flexible polyurethane foam (FU) has been commonly used in the sound absorption field due to its low cost and ease of processability [6]. Polyurethane foam primarily uses an internal porous structure and restrained air to dissipate the energy of sound waves, thereby obtaining sound absorption efficacy [7,8].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional, Polyurethane-Based Foam Composites Reinforced by a Fabric Structure: Preparation, Mechanical, Acoustic, and EMI Shielding Properties

Wang

et al. 2018

Materials

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This study proposes multifunctional, fabric-reinforced composites (MFRCs) based on a bionic design, which are prepared by two-step foaming and a combination of different fabric constructs. MFRCs are evaluated in terms of sound absorption, compression resistance, electromagnetic interference shielding effectiveness (EMI SE), and drop impact, thereby examining the effects of fabric structures. The test results indicate that the enhanced composites have superiority functions when combined with carbon fabric in the upper layer and spacer fabric in the lower layer. They have maximum compression resistance, which is 116.9 kPa at a strain of 60%, and their compression strength is increased by 135.9% compared with the control specimen. As a result of the fabric structure on the cell morphology, the maximum resonance peak shifts toward high frequency when using spacer fabric as the intermediate layer. The average sound absorption coefficient is above 0.7 at 1000–4000 Hz. The reinforced composites possessed EMI SE of 50 dB at 2 GHz; an attenuation rate of 99.999% was obtained, suggesting a good practical application value. Furthermore, the cushioning effect of the MFRCs improved significantly, and the maximum dynamic contact force during the impact process was reduced by 57.28% compared with composites without any fabric structure. The resulting MFRCs are expected to be used as sound absorbent security walls, machinery equipment, and packaging for commercial EMI shielding applications in the future.

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Cell openness manipulation of low density polyurethane foam for efficient sound absorption

Cited by 91 publications

References 58 publications

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Thermal Insulation and Sound Absorption Properties of Open-Cell Polyurethane Foams Modified with Bio-Polyol Based on Used Cooking Oil

Recent Trends of Foaming in Polymer Processing: A Review

Multifunctional, Polyurethane-Based Foam Composites Reinforced by a Fabric Structure: Preparation, Mechanical, Acoustic, and EMI Shielding Properties

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