Excellent Wideband Acoustic Absorption of a Multifunctional Composite Fibrous Panel with a Dual-Pore Network from Milled Corrugated Box Wastes

Abstract

A multifunctional composite fibrous sound-absorption panel was acquired via sustainable fabrication from milling corrugated cardboard box wastes to unleash its fibrous property, creating a high-porosity material. Here, a multifunctional composite fibrous panel from the milled fibers of corrugated cardboard boxes reinforced by cross-linked polyvinyl alcohol as a biodegradable binder is generated. It is designed to have a dual-pore structure with a low density of 0.04 g/cm3, which can withstand a load of 5000 times its weight and is effective for the dissipation of sound at a wide range of frequencies. The prepared material demonstrates an excellent average absorption coefficient of 0.83 at wideband frequency, which is about 280–6300 Hz. The outstanding sound absorption performance of the material is primarily ascribed to its dual-pore architecture, the anisotropic pores interconnected by the random pores formed from the collection of cardboard box fibers within the architecture of the porous material, its thickness, and the concentration of corrugated box fibers. Furthermore, the prepared material manifests a unique porous morphological structure, favorable thermal properties, excellent mechanical stability and sustainability, and superhydrophobic properties. The successful fabrication of this riveting material endowed a promising result that may be applicable for various types of applications.

Gradient Pore-Structured Polymeric Fibrous Aerogels for Effective Low-Frequency Noise Absorption

“…4,7,9−19 Various porous materials, spanning from natural fibers like cotton and wool to synthetic options such as foams and aerogels based on p o l y m e r s , a r e e m p l o y e d f o r n o i s e r e d u ction. [4][5][6]10,[13][14][15][18][19][20]22,23 These porous materials are extensively utilized for noise absorption due to their commendable p e r f o r m a n c e i n m e d i u m a n d h i g h -f r e q u e n c y ranges. [4][5][6]10,[13][14][15][18][19][20]22,23 However, the basic simple porous nature of these materials results in less effective absorption of low-frequency noise.…”

“…[4][5][6]10,[13][14][15][18][19][20]22,23 These porous materials are extensively utilized for noise absorption due to their commendable p e r f o r m a n c e i n m e d i u m a n d h i g h -f r e q u e n c y ranges. [4][5][6]10,[13][14][15][18][19][20]22,23 However, the basic simple porous nature of these materials results in less effective absorption of low-frequency noise. To address this challenge, various methods have been developed, including increasing the density/thickness of materials and constructing 3D structures.…”

Enhanced Low Frequency Sound Absorption of Bilayer Nanocomposite Acoustic Absorber Laminated with Microperforated Nanofiber Felt

“…Porous media such as polymer foams, aerogels, and fibrous materials have been a reliable preference for sound absorption, especially for mid- to high frequencies (>2000 Hz) due to their interconnected pore structure which allows sound waves to propagate and be dissipated as thermal and viscous losses. , Optimal airflow resistivity, open porosity, pore distribution, and dynamic tortuosity are just some of the properties that have shown significant impact on the sound absorption capacity of the material. − Electrospun nanofibrous sheets exhibit these properties as these are highly porous and super lightweight materials with a high surface-to-volume ratio, which makes them ideal for sound absorption. Theoretically, when nanofibrous sheets are to be exposed to incident sound, it is possible for the nanofibers to resonate on the material’s own frequency.…”