Improving the sound absorption performance of sustainable thermal insulation materials: Natural hemp fibres

Santoni, Andrea; Bonfiglio, Paolo; Fausti, Patrizio; Marescotti, Cristina; Mazzanti, Valentina; Mollica, Francesco; Pompoli, Francesco

doi:10.1016/j.apacoust.2019.02.022

Cited by 101 publications

(30 citation statements)

References 39 publications

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“…For this purpose, first, the SACs of a natural fiber sample are calculated using the models mentioned above, and the results are compared in Figure 6. The properties of this porous sample made from natural hemp fibers are h = 40 mm, ϕ ¼ 0:93, σ ¼ 4920 Ns/m 4 , α 1 ¼ 1:05, ^¼ 115 μm, ^0 ¼ 170 μm, and ρ s ¼ 88 kg/m 3 (Santoni et al 2019). Using Eq.…”

Section: Evaluation Of the Modelsmentioning

confidence: 99%

Assessment of the Measurement and Prediction Methods for the Acoustic Properties of Natural Fiber Samples and Evaluation of Their Properties

Körük

2021

Journal of Natural Fibers

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Although some studies have been conducted to show how natural fibers can replace synthetic materials, the use of many natural fibers is still limited. On the other hand, the use of natural fibers can become very common in many applications once their performance is fully understood. This paper aims to present a critical assessment of the acoustic properties of natural fiber samples. First, the methods commonly used for the measurement and prediction of the acoustic properties of natural fiber samples are determined. Second, the common techniques for measuring sound absorption coefficients (SACs) and sound transmission losses (STLs) are presented, and their advantages and limitations are evaluated. After that, the models commonly used for the prediction of acoustic properties are presented. Then, the SACs of many natural fiber samples are presented along with the thickness, bulk density and flow resistivity of the samples. Furthermore, the SACs of the samples are normalized using sample thickness and bulk density, and the sound absorption performance of the fiber samples is evaluated. Based on the results of many natural fiber samples, an empirical model for estimating the SACs of natural fiber samples is presented. Finally, the STLs of some porous natural fiber samples are presented.

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Section: Evaluation Of the Modelsmentioning

confidence: 99%

Assessment of the Measurement and Prediction Methods for the Acoustic Properties of Natural Fiber Samples and Evaluation of Their Properties

Körük

2021

Journal of Natural Fibers

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“…Tran et al [93] showed that hemp concrete can decrease daily indoor relative humidity variations and reduce energy consumption by 45% as compared to cellular concrete. Recent studies have shown that hemp fibers can also be employed for sound insulation and/or sound absorption [94].…”

Section: Industrial Applicationsmentioning

confidence: 99%

Industrial Hemp Fibers: An Overview

Manaia¹,

Manaia²,

Rodriges

2019

Fibers

185

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Industrial hemp (Cannabis sativa) is one of the most available and widely produced bast fibers with high cellulose content. Interest in these fibers is warranted due to environmental protection challenges as well as their inherent properties such as low density, high specific strength, and stiffness. In addition, advanced research and progress have gone into increasing their mechanical performance through surface treatments and in the development of new materials. The most promising application for hemp fibers is as reinforcement in polymeric composites or through hybridization. Nonetheless, more research is needed to improve their properties and expand their range of applications. The biodegradability issue is one problem that must be addressed when considering long life-cycle applications as the reproducibility of these composites’ final properties. This review is a comprehensive literature review on hemp fibers. It includes hemp fibers’ chemical and mechanical properties, surface modifications, hybrid composites, as well as current and future applications.

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“…For these reasons, natural fiber filled polymers, commonly known as “biocomposites”, are gaining important market shares in many relevant industrial sectors such as automotive, construction, thermal insulating and sound absorbing materials [32,33]. On the other hand, having natural fibers within the thermoplastic polymer poses a few peculiar problems.…”

Section: Introductionmentioning

confidence: 99%

FDM 3D Printing of Polymers Containing Natural Fillers: A Review of their Mechanical Properties

2019

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As biodegradable thermoplastics are more and more penetrating the market of filaments for fused deposition modeling (FDM) 3D printing, fillers in the form of natural fibers are convenient: They have the clear advantage of reducing cost, yet retaining the filament biodegradability characteristics. In plastics that are processed through standard techniques (e.g., extrusion or injection molding), natural fibers have a mild reinforcing function, improving stiffness and strength, it is thus interesting to evaluate whether the same holds true also in the case of FDM produced components. The results analyzed in this review show that the mechanical properties of the most common materials, i.e., acrylonitrile-butadiene-styrene (ABS) and PLA, do not benefit from biofillers, while other less widely used polymers, such as the polyolefins, are found to become more performant. Much research has been devoted to studying the effect of additive formulation and processing parameters on the mechanical properties of biofilled 3D printed specimens. The results look promising due to the relevant number of articles published in this field in the last few years. This notwithstanding, not all aspects have been explored and more could potentially be obtained through modifications of the usual FDM techniques and the devices that have been used so far.

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Improving the sound absorption performance of sustainable thermal insulation materials: Natural hemp fibres

Cited by 101 publications

References 39 publications

Assessment of the Measurement and Prediction Methods for the Acoustic Properties of Natural Fiber Samples and Evaluation of Their Properties

Assessment of the Measurement and Prediction Methods for the Acoustic Properties of Natural Fiber Samples and Evaluation of Their Properties

Industrial Hemp Fibers: An Overview

FDM 3D Printing of Polymers Containing Natural Fillers: A Review of their Mechanical Properties

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