Development of optimal polymeric foams with superior sound absorption and transmission loss

Nourmohammadi, Mohammad; Jahanmardi, Reza; Moeenfard, Hamid; Zohuri, Gholamhossein; Bazgir, Saeed

doi:10.1002/app.52507

Cited by 5 publications

(3 citation statements)

References 30 publications

(58 reference statements)

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“…Compared with metal foams, polymers, and their composite foams have the merits of lightweight and good corrosion resistance [29][30][31]. Mohammad et al [32] prepared vinyl-vinyl acetate composite foams lled with nano-silica, nano-clay, and graphene nanosheets through the method of uniform mixing, blow molding, and hot pressing. The ethylene vinyl acetate composite foams showed the best sound absorption performance with a noise reduction coe cient of 0.225 at a dosage of 2 phr for both silica and nano-clay and 0.2 phr for graphene nanosheets.…”

Section: Introductionmentioning

confidence: 99%

Sound absorption polyimide composite aerogels for ancient architectures’ protection

Zhao

Duan

et al. 2023

Adv Compos Hybrid Mater

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Ancient architectures are an important part of immovable cultural heritage and the largest surviving amount of tangible cultural heritage in the world. However, the increasingly serious noise pollution will not only affect the sanctity of ancient architectures, but damage the internal structure caused by continuous mechanical vibration, and affect their lifetime. In this paper, diaminodiphenyl ether and pyromellitic dianhydride were used as monomers, modi ed by triethylamine to synthesize water-soluble polyamide acids, and calcium carbonate (CaCO 3 ) was used as ller to prepare CaCO 3 /polyimide (CaCO 3 /PI) composite aerogels by homogeneous mixing, freeze-drying and thermal imidization. CaCO 3 can effectively adjust the pore wall roughness of CaCO 3 /PI composite aerogels, so as to improve their sound absorption performance. When the amount of CaCO 3 is 4 wt%, CaCO 3 /PI composite aerogels exhibit optimal sound absorption performance, excellent mechanical properties, thermal insulation and heat resistance. The corresponding noise reduction coe cient is 0.327 and the average sound absorption coe cient is 0.903 in the frequency range of 2000 ~ 6300 Hz. Young's modulus is 4.03 kPa, stress loss and plastic deformation after 100 compression cycles with a maximum strain of 50% are 3.27% and 2.17%, respectively. The energy loss coe cient is 0.248, thermal conductivity is 0.038 W/(m•K), and heat resistance index is 334.1 o C. The CaCO 3 /PI composite aerogels show momentous application prospects in the eld of ancient architectures protection.

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Section: Introductionmentioning

confidence: 99%

Sound absorption polyimide composite aerogels for ancient architectures’ protection

Zhao

Duan

et al. 2023

Adv Compos Hybrid Mater

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“…They observed a SAC of 0.99 at 1.99 kHz frequency for 15 wt% fiber reinforcement. Nourmohammadi et al 36 presented the SA of different ethylene‐based foam samples and observed that adding multiple nanomaterials in polymeric foam samples enhanced the SAC.…”

Section: Introductionmentioning

confidence: 99%

Acoustic characterization of natural areca catechu fiber‐reinforced flexible polyurethane foam composites

M. B.,

G. C.,

Pitchaimani

2023

J of Applied Polymer Sci

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The development of acoustic absorbers from natural resources is a novel approach in acoustics. In the current study, the effect of unprocessed raw areca fiber (AF) particle reinforcement on the sound absorption (SA) behavior of polyurethane (PU) foam composites is investigated. Influences of fiber weight percentage and graded distribution of fiber with varying fiber weight percentage on the SA coefficient (SAC) of the composite foams are examined through the impedance tube approach. Morphological studies are carried out with the help of FESEM images to investigate the acoustic energy dissipation mechanism of PU foam and its composites. It is found that the SA capability of the composite foam is enhanced by increased fiber weight percentage, graded distribution of fiber wt%, varying sample thickness, and air cavity length. In general, PU‐AF composite specimens show a peak SA value of 0.95 around 450 Hz, which is not the case for other natural fiber results available in the literature. Theoretical results predicted using the JCA (Johnson‐Champoux Allard) model agree with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Sound Absorption Polyimide Composite Aerogels for Ancient Architectures Protection

Zhao

Duan

et al. 2023

Preprint

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Ancient architectures are an important part of immovable cultural heritage and the largest surviving amount of tangible cultural heritage in the world. However, the increasingly serious noise pollution will not only affect the sanctity of ancient architectures, but damage the internal structure caused by continuous mechanical vibration, and affect their lifetime. In this paper, diaminodiphenyl ether and pyromellitic dianhydride were used as monomers, modified by triethylamine to synthesize water-soluble polyamide acids, and calcium carbonate (CaCO3) was used as filler to prepare CaCO3/polyimide (CaCO3/PI) composite aerogels by homogeneous mixing, freeze-drying and thermal imidization. CaCO3 can effectively adjust the pore wall roughness of CaCO3/PI composite aerogels, so as to improve their sound absorption performance. When the amount of CaCO3 is 4 wt%, CaCO3/PI composite aerogels exhibit optimal sound absorption performance, excellent mechanical properties, thermal insulation and heat resistance. The corresponding noise reduction coefficient is 0.327 and the average sound absorption coefficient is 0.903 in the frequency range of 2000 ~ 6300 Hz. Young’s modulus is 4.03 kPa, stress loss and plastic deformation after 100 compression cycles with a maximum strain of 50% are 3.27% and 2.17%, respectively. The energy loss coefficient is 0.248, thermal conductivity is 0.038 W/(m·K), and heat resistance index is 334.1oC. The CaCO3/PI composite aerogels show momentous application prospects in the field of ancient architectures protection.

show abstract

Development of optimal polymeric foams with superior sound absorption and transmission loss

Cited by 5 publications

References 30 publications

Sound absorption polyimide composite aerogels for ancient architectures’ protection

Sound absorption polyimide composite aerogels for ancient architectures’ protection

Acoustic characterization of natural areca catechu fiber‐reinforced flexible polyurethane foam composites

Sound Absorption Polyimide Composite Aerogels for Ancient Architectures Protection

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