Sound absorption properties of polyurethane foams derived from crude glycerol and liquefied coffee grounds polyol
authors Gama, N; Silva, R; Carvalho, APO; Ferreira, A; Barros-Timmons, A
nationality International
journal POLYMER TESTING
author keywords Polyurethane foams; Crude glycerol; Liquefaction of biomass; Coffee grounds derived polyol; Sound absorption
keywords ACOUSTICAL PROPERTIES; THERMAL INSULATION; COMPOSITE FOAMS; MORPHOLOGY; WASTE
abstract The main objective of this study was to evaluate the sound absorption properties of rigid polyurethane foams (PUFs) produced from crude glycerol (CG) and/or liquefied coffee grounds derived polyol (POL). The lignin content of POL proved to have a major influence on the structure and mechanical properties of the foams. Indeed, the POL content increased the cell size of the foams and their stiffness, which subsequently influenced the sound absorption coefficients. The POL derived foam has slightly higher sound absorption coefficient values at lower frequencies, while the CG foam has higher sound absorption coefficient values at higher frequencies. In turn, the foam prepared using a 50/50 mixture of polyols presents slightly higher sound absorption coefficient values in the medium frequencies range due to a balance between the cell structure and the mechanical properties. The results obtained seem to suggest that the mechanisms involved in sound wave absorption depend on the formulation used to prepare the foams. Additionally higher POL contents improved the thermal stability of PUFs as well as their mechanical properties. From this work the suitability of CG and/or POL derived PUFs as sound absorbing materials has been proven. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0142-9418
isbn 1873-2348
year published 2017
volume 62
beginning page 13
ending page 22
digital object identifier (doi) 10.1016/j.polyrnertesting.2017.05.042
web of science category Materials Science, Characterization & Testing; Polymer Science
subject category Materials Science; Polymer Science
unique article identifier WOS:000411537900003
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  impact metrics
journal analysis (jcr 2017):
journal impact factor 2.247
5 year journal impact factor 2.628
category normalized journal impact factor percentile 69.801
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