Sound damping of a polyurethane foam nanocomposite

Sung, Chang Kyung; Lee, Kyung Hwa; Lee, Kyu Se; Oh, Seung Min; Kim, Jae-Hoon; Kim, Min Seock; Jeong, Han Mo

doi:10.1007/bf03218812

Cited by 83 publications

(43 citation statements)

References 20 publications

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“…The origins of these two peaks are not fully understood. The majority of authors report on one maximum in flexible PU foams [12,15,16]. However, Yamashita et al [18] found two maxima, positioned at similar frequencies as in the present study.…”

Section: Acoustic Dampingcontrasting

confidence: 36%

Vibration and Acoustic Damping of Flexible Polyurethane Foams Modified with a Hyperbranched Polymer

Andersson

Lundmark

Magnusson

et al. 2009

Journal of Cellular Plastics

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The dynamic mechanical properties and acoustic damping of polyurethane (PU) foams loaded with a hyperbranched polymer (HBP) have been studied. The results show a significant modulus enhancement parallel to an increased vibration damping in the low frequency range of %1 Hz with increased amount of HBP. Furthermore, an increased acoustic damping in the frequency interval of 500-1600 Hz is observed with increasing amount of HBP. The origin of these property enhancements are sought in the morphology and the chemical composition of the PU foam. It has been found that no visible differences in cell sizes and strut thicknesses exist among the foams. However, FTIR reveals significant differences in chemical composition between the foams of different HBP content, indicating increased crosslinking.

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Section: Acoustic Dampingcontrasting

confidence: 36%

Vibration and Acoustic Damping of Flexible Polyurethane Foams Modified with a Hyperbranched Polymer

Andersson

Lundmark

Magnusson

et al. 2009

Journal of Cellular Plastics

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show abstract

“…At the same time, the addition of bamboo chips may lead to the cell deformation and there will be more frictions due to the bamboo leaves on the cell wall, generating more sound energy converted to thermal energy . When the fillers are dispersed in the cell or wall of the foams, the energy dissipation as heat through hysteresis can be increased, because the cell or wall of the foams should recovers its deformation caused by sound waves .…”

Section: Resultsmentioning

confidence: 99%

“…Verdejo et al found that low loading fraction of carbon nanotubes (CNTs) in flexible polyurethane foams had relatively high effect in sound absorption, even 0.1% CNTs could enhance the acoustic absorption dramatically. Sung et al integrated various kinds of montmorillonite into PU foams to investigate the effects of layered silicate on sound damping. Vermiculite and perlite fillers were incorporated into PU foams to improve sound absorption, thermal insulation, and rebound resilience properties .…”

Section: Introductionmentioning

confidence: 99%

The acoustic property study of polyurethane foam with addition of bamboo leaves particles

Chen

Jiang

2016

Polymer Composites

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In this study, the acoustic properties of polyurethane (PU) foams produced with the biodegradable, easily disposable natural bamboo leaves particles (bamboo chips and bamboo stems) were investigated. Acoustical properties of PU foam composites as normal sound absorption coefficient and sound transmission loss were measured using a two‐microphone impedance tube and a four‐microphone impedance tube, respectively. The microstructures of PU foam composites were examined using scanning electron microscope (SEM) and air‐flow resistivity was also measured. The results illustrate that suitable constituents of bamboo chips and stems have significantly enhanced the sound absorption and insulation properties of the PU foam composites over the entire frequency range, especially giving rise to a considerable improvement of low‐frequency sound absorption and sound insulation characteristics. PU foam composites with 6% of bamboo stems obtain the highest NRC (noise reduction coefficient) value with 0.714 and the maximum value of the sound absorption coefficient is 0.971, achieved at 6,300 Hz. Besides, PU foam composites with 8% of 2–3 mm bamboo chips exhibit the best sound insulation with high transmission loss around 18.9 dB over the entire frequency range (100–6,300 Hz). POLYM. COMPOS., 39:1370–1381, 2018. © 2016 Society of Plastics Engineers

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“…Polyurethane foam (PUF) has been widely studied due to its various thermal insulating applications in building construction, liquefied natural gas storage tank and carrier formers, and refrigeration . Another important application is as sound absorber in the design of automobiles, using the acoustic damping abilities of PUF . There are several different frequency ranges in a vehicle, some of which originate from the rotation of the engine at ∼5–50 Hz, and some result from the uneven surface of the road and transfer into the vehicle in the frequency range of 500–3,000 Hz .…”

Section: Introductionmentioning

confidence: 99%

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

Ryu

Kim

et al. 2017

Polymer Composites

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The sound absorption properties and airflow resistivity of polyurethane foams (PUFs) with multiwall carbon nanotube (MWCNT), perfluoroalkane (PFA), dimethylsiloxane (HMDS), and MWCNT/PFA hybrid additives were investigated with varying additive content. The results show the close relationship of the sound absorption coefficient and airflow resistivity, and increasing flow resistivity was found to improve the sound absorption coefficient of the PUF. For the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) hybrid additives, the sound absorption coefficient and airflow resistivity were 0.80 (in the frequency range of 1,600–2,500 Hz) and 439,900 Ns/m4, respectively, which were the highest values among the investigated additive species and additive content. The sound absorption coefficient of the PUF with MWCNT (at 0.50 phr)/PFA (at 1.25 phr) was increased by 82.0% compared to that of the PUF without additives, probably because the PUF has the smallest cell size among the additive species and compositions investigated in this study. The results of the sound absorption coefficient, airflow resistivity, and cell size of the PUF suggest that to decrease the cell size and to increase the tortuous paths of the foams, MWCNT/PFA hybrid additives appeared to be the most effective additives and showed synergistic effects in the formation of PUF, and its small cell size increased the sound absorption properties of PUF. POLYM. COMPOS., 39:E1087–E1098, 2018. © 2017 Society of Plastics Engineers

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Sound damping of a polyurethane foam nanocomposite

Cited by 83 publications

References 20 publications

Vibration and Acoustic Damping of Flexible Polyurethane Foams Modified with a Hyperbranched Polymer

Vibration and Acoustic Damping of Flexible Polyurethane Foams Modified with a Hyperbranched Polymer

The acoustic property study of polyurethane foam with addition of bamboo leaves particles

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

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