Polyurethane foams based on modified tung oil and reinforced with rice husk ash II: Mechanical characterization
- Ribeiro Da Silva, Virginia
- Mosiewicki, Mirna Alejandra
- Yoshida, Maria Irene
- Coelho Da Silva, Mercês
- Stefani, Pablo Marcelo
- Marcovich, Norma Esther
DOIAbstract
Viscoelastic polyurethane (PU) foams based on modified tung oil, ethylene glycol and polymeric MDI, and reinforced with rice husk ash (RHA), were prepared by a free-rise pouring method and characterized in terms of density, compression and dynamic mechanical behavior. The density of foams ranged between 50 and 90 kg/m3, depending on the position of the sample with respect to the foam rise direction and filler content. As revealed by dynamic mechanical tests, the foams exhibited two different and broad thermal transitions, the temperature of their maxima depending on filler concentration. Compression modulus, compressive strength and storage modulus increase as foam density increases but decreases as rice husk ash concentration increases due...
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