INVESTIGADORES
MARCOVICH norma Esther
congresos y reuniones científicas
Título:
Biobased Porous Acoustical Absorber Made from Polyurethane and Waste Tires Particles
Autor/es:
NILDA VECHIATTI; GUILLERMO SOTO; FEDERICO LASI; NORMA E. MARCOVICH; MIRNA A. MOSIEWICKI; ALEJANDRO ARMAS
Lugar:
Buenos Aires
Reunión:
Congreso; 22nd International Congress on Acoustics, ICA 2016; 2016
Resumen:
The production of flexible polyurethane foams (FPF)incorporating bio/recycled raw materials is an interesting alternative toconventional acoustic absorbent materials. In this sense, bio-based polyolslike glycerol or hydroxylated methyl esters derived from tung oil asmultifunctional polyols, and waste tires particles as fillers with capabilityfor acoustical absorption and low thermal conductivity, are prospectivefeedstocks for FPF preparation. In this work, FPF were prepared by addingdifferent amounts of these components to a formulation based on a commercialpolyether polyol. Results of normal sound absorption coefficient measurementsat different frequencies, scanning electron microscopy analysis and compressiontests are presented and discussed. The addition of waste tires particles orglycerol to the commercial formulation gives good performance as acousticabsorbers from 400 500 Hz, with NRC and SAA values near and above 50%.Moreover, the absorption coefficient reaches high values mostly at the highestevaluated frequencies (~62-89% at 2000 Hz and ~70-91% at 5000 Hz), for 30 mmthickness samples.  On the other hand,the obtained FPF presented enhanced both the modulus and yield stress and inall the cases, a high recovery of the strain (>90%) applied in compressiontests was attained after 24 hours. Scanning electron microscopy micrographsrevealed that the obtained foams present a combination of open and closed cellstructures and both, the modifiers and particles, tend to decrease the cellsize. Based on acoustical and mechanical performance, and morphologicalanalysis, the results show that these new kind of materials could be innovativesound absorbers, cheaper and environmentally more convenient in comparison withother available materials.