Bio-based polyurethane foams toward applications beyond thermal insulation
authors Gama, NV; Soares, B; Freire, CSR; Silva, R; Neto, CP; Barros-Timmons, A; Ferreira, A
nationality International
journal MATERIALS & DESIGN
author keywords Polyurethane foams; Viscoelastic behavior; Liquefied coffee grounds
keywords OIL-BASED POLYOL; MECHANICAL-PROPERTIES; COFFEE; LIQUEFACTION; GLYCEROL; LIGNIN; ACID
abstract In this work the preparation of viscoelastic bio-based polyurethane foams (PUFs) using polyols obtained via acid liquefaction of coffee grounds wastes has been optimized. In a first stage, the effect of different ratios of isocyanate content to hydroxyl number (0.6, 0.7 and 0.8) and of three distinct percentages of catalyst (3%, 5% and 7%) on the extent of the polymerization reaction was studied by infrared spectroscopy. Next, different percentages of surfactant (14%, 16% and 18%) and blowing agent (12%, 14% and 16%) were used to assess their effect on the density, thermal conductivity and mechanical properties of the foams, including their recovery time. The mechanical properties of the ensuing foams proved to be very interesting due to their viscoelastic behavior. PUFs were also characterized by scanning electron microscopy (SEM) revealing a typical cellular structure and by thermogravimetric analysis (TGA) which proved that these materials are thermally stable up to 190 degrees C. These results suggest other potential applications for these materials beyond heat insulation in areas where damping properties can be an added value. (C) 2015 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0264-1275
year published 2015
volume 76
beginning page 77
ending page 85
digital object identifier (doi) 10.1016/j.matdes.2015.03.032
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000352696100011
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journal impact factor 4.525
5 year journal impact factor 4.753
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