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Open AccessArticle

Composite Eco-Friendly Sound Absorbing Materials Made of Recycled Textile Waste and Biopolymers

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Dipartimento di Scienze dell’Ingegneria Civile e dell’Architettura, Politecnico di Bari, via Orabona 4, I-70125 Bari, Italy
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Grupo de Investigación en la Industria Textil (GIITEX), Departamento de Ingeniería Textil y Papelera, Universitat Politècnica de València, 46022 Alcoy, Alicante, Spain
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Author to whom correspondence should be addressed.
Portions of this paper have been presented in the conference paper “Preliminary investigation on the acoustic properties of absorbers made of recycled textile fibers”, by Rubino C., Bonet-Aracil M., Liuzzi S., Martellotta F., in Proceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019, 9–13 September 2019, Aachen, Germany.
Materials 2019, 12(23), 4020; https://doi.org/10.3390/ma12234020
Received: 6 November 2019 / Revised: 28 November 2019 / Accepted: 29 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Innovative Composite Materials for Sound Absorption and Insulation)
In recent years, the interest in reusing recycled fibers as building materials has been growing as a consequence of their ability to reduce the production of waste and the use of virgin resources, taking advantage of the potential that fibrous materials may offer to improve thermal and acoustic comfort. Composite panels, made of 100% wool waste fibers and bound by means of either a chitosan solution and a gum Arabic solution, were tested and characterized in terms of acoustic and non-acoustic properties. Samples with a 5 cm thickness and different density values were made to investigate the influence of flow resistivity on the final performance. Experimental results demonstrated that the samples had thermal conductivity ranging between 0.049 and 0.060 W/(m K), well comparable to conventional building materials. Similarly, acoustic results were very promising, showing absorption coefficients that, for the given thickness, were generally higher than 0.5 from 500 Hz on, and higher than 0.9 from 1 kHz on. Finally, the effects of the non-acoustic properties and of the air gap behind the samples on the acoustic behavior were also analyzed, proving that the agreement with absorption values predicted by empirical models was also very good. View Full-Text
Keywords: textile waste; biopolymers; sound absorption; sustainable materials; circular economy textile waste; biopolymers; sound absorption; sustainable materials; circular economy
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Rubino, C.; Bonet Aracil, M.; Gisbert-Payá, J.; Liuzzi, S.; Stefanizzi, P.; Zamorano Cantó, M.; Martellotta, F. Composite Eco-Friendly Sound Absorbing Materials Made of Recycled Textile Waste and Biopolymers. Materials 2019, 12, 4020.

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