Abstract:A lightweight acoustic composite foams with unique sound absorption feature is reported, that is, the foam acoustic composite demonstrates surprisingly stable sound absorption performance in a wide bandwidth of frequency. The unique acoustic properties are attributed to the highly exfoliated nanolayered biocarbon nucleation, derived from the pyrolytic pinus resinosa, with tailoring the foam structure and properties. Polystyrene (PS) composite foams with porous graphitic biocarbon are obtained by sequestering r… Show more
“…Graphene 113–116 graphite 143 biochar 144 CNTs 143,145 have been employed by several authors as a heterogeneous foam nucleating agent. Okolieocha et al 56 studied the effect of additive concentration on the cell morphology of PS composite foam and reported a cell size was reduced from 400 µm to 115 µm and 65 µm for CNT and graphene, respectively; PS-graphene composite foam was not tested for thermal conductivity.…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…160,161 Because of the decrease in cell size and increase in cell density, the sound absorption range of the PS composite foam was shifted to a higher frequency than the pure PS foams. The internal dissipation of sound energy was enhanced, and the foam had applications in narrow acoustic absorption bands.Figure 7.Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…The internal dissipation of sound energy was enhanced, and the foam had applications in narrow acoustic absorption bands.Figure 7.Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…When sound waves enter connected pores, refraction dissipates the sound waves. 64,154 Jian et al 144 studied pine derived biochar as an alternative option for a lightweight acoustic composite system with tailored foam structure and properties using supercritical CO 2 . Biochar used here was derived from pinus resinova to control cell structure and morphology.…”
Polystyrene (PS) composite foams are an intriguing class of materials that are well established for thermal insulation in construction and lightweight recyclable components in automotives. Research has shown the remarkable properties of these foams in terms of thermal and sound insulation and fire retardancy that can be enhanced by incorporating carbon fillers such as graphite, graphene, and biochar. Several methods have been examined by researchers to mix carbon with the polystyrene matrix and prepare PS carbon composite foams, which can broadly be categorized into suspension polymerization, solution mixing and melt blending. These methodologies along with foaming techniques for the expansion of PS using various blowing agents are reviewed. We also review the most relevant research studies in the field of PS carbon composite foams for insulation (thermal and sound) and fire retardancy. Due to its high infrared radiation absorption capacity and hetero nucleating action, expandable graphite and graphene can lead to excellent thermal and sound insulation along with fire retardancy in a PS foam, thus resulting in significant energy savings in a building. Biochar, due to its inherent low thermal conductivity and nucleating action, modifies the foam morphology, leading to enhanced heat and sound absorption and thus is a low-cost renewable carbon alternative that promotes the circular economy.
“…Graphene 113–116 graphite 143 biochar 144 CNTs 143,145 have been employed by several authors as a heterogeneous foam nucleating agent. Okolieocha et al 56 studied the effect of additive concentration on the cell morphology of PS composite foam and reported a cell size was reduced from 400 µm to 115 µm and 65 µm for CNT and graphene, respectively; PS-graphene composite foam was not tested for thermal conductivity.…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…160,161 Because of the decrease in cell size and increase in cell density, the sound absorption range of the PS composite foam was shifted to a higher frequency than the pure PS foams. The internal dissipation of sound energy was enhanced, and the foam had applications in narrow acoustic absorption bands.Figure 7.Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…The internal dissipation of sound energy was enhanced, and the foam had applications in narrow acoustic absorption bands.Figure 7.Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…Sound absorption property of different PS/biochar composite foam 144 (Reproduced with permission from ref. 144, Copyright 2021, John Wiley, and Sons).…”
Section: Influence Of Carbon On the Performance Of Ps-carbon Composit...mentioning
confidence: 99%
“…When sound waves enter connected pores, refraction dissipates the sound waves. 64,154 Jian et al 144 studied pine derived biochar as an alternative option for a lightweight acoustic composite system with tailored foam structure and properties using supercritical CO 2 . Biochar used here was derived from pinus resinova to control cell structure and morphology.…”
Polystyrene (PS) composite foams are an intriguing class of materials that are well established for thermal insulation in construction and lightweight recyclable components in automotives. Research has shown the remarkable properties of these foams in terms of thermal and sound insulation and fire retardancy that can be enhanced by incorporating carbon fillers such as graphite, graphene, and biochar. Several methods have been examined by researchers to mix carbon with the polystyrene matrix and prepare PS carbon composite foams, which can broadly be categorized into suspension polymerization, solution mixing and melt blending. These methodologies along with foaming techniques for the expansion of PS using various blowing agents are reviewed. We also review the most relevant research studies in the field of PS carbon composite foams for insulation (thermal and sound) and fire retardancy. Due to its high infrared radiation absorption capacity and hetero nucleating action, expandable graphite and graphene can lead to excellent thermal and sound insulation along with fire retardancy in a PS foam, thus resulting in significant energy savings in a building. Biochar, due to its inherent low thermal conductivity and nucleating action, modifies the foam morphology, leading to enhanced heat and sound absorption and thus is a low-cost renewable carbon alternative that promotes the circular economy.
Bead foaming is a burgeoning technology for manufacturing polymer foams with lightweight and complex geometrical structures, and one of the representative cases is polystyrene (PS) bead foams. Here, a facile method is proposed to manufacture extruded PS bead foams via supercritical CO2 extrusion foaming. Secondary foaming is introduced to improve the expansion ratio of extruded bead foams and to reveal their bead bonding mechanism. For example, the expansion ratio of extruded bead foams can be increased from 21‐fold to 40‐fold after secondary foaming, illustrating that extruded bead foams have excellent secondary growth ability. In addition, the effect of molding pressure on the interface bonding of bead foams is also studied. It can be seen that there is no obvious gap between the extruded bead foams, even better than the commodity foamed boards. Benefitting from the excellent bonding effect, the as‐prepared foamed boards exhibit outstanding mechanical properties.
Various acoustic materials have been developed to resolve noise pollution problem in many industries. Especially, materials with porous structure have been broadly used to absorb sound energy in civil construction and transportation area. Polyurethane (PU) porous materials possess excellent damping properties, good toughness and well‐developed pore structures, which have a broad application prospect in sound absorption field. This work aimed to summarize the recent progress of fabrication and structure for PU porous materials in sound absorption application. The sound absorption mechanisms of porous materials were introduced. Different kinds of structure for typical PU porous materials in sound absorption application were covered and highlighted, which included PU foam, modified PU porous materials, aerogel, templated PU and special PU porous materials. Finally, the development direction and existing problems of PU material in sound absorption application were briefly prospected. It can be expected that porous PU with high sound absorption coefficient can be obtained by using some facile methods. The design and accurate regulation of porous structures or construction of multilayer sound absorption structure will be favorably recommended to fulfill the high demand of industrial and commercial applications in the future work.This article is protected by copyright. All rights reserved
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