1. Polyurethane foams based on modified tung oil and reinforced with rice husk ash II: Mechanical characterization
- Author
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Virginia Ribeiro da Silva, Pablo Marcelo Stefani, Mirna Alejandra Mosiewicki, Maria Irene Yoshida, Mercês Coelho da Silva, and Norma Esther Marcovich
- Subjects
Filler (packaging) ,Polyurethane Foam Tung Oil Mechanical Properties ,Materials science ,Polymers and Plastics ,Organic Chemistry ,Modulus ,Dynamic mechanical analysis ,INGENIERÍAS Y TECNOLOGÍAS ,Compuestos ,Compression (physics) ,Husk ,Viscoelasticity ,chemistry.chemical_compound ,Compressive strength ,chemistry ,purl.org/becyt/ford/2 [https] ,Ingeniería de los Materiales ,Composite material ,purl.org/becyt/ford/2.5 [https] ,Polyurethane - Abstract
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 to the detrimental changes induced by the filler in the foam cellular structure. However, densification strain exhibits the opposite behavior, indicating that reinforced foams can sustain slightly higher deformations without collapsing, probably due to a reduced reactivity of the components induced by the filler. © 2013 Elsevier Ltd. All rights reserved. Fil: Ribeiro Da Silva, Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina. Universidade Federal de Minas Gerais; Brasil. Ministry of Education of Brazil. CAPES Foundation; Brasil Fil: Mosiewicki, Mirna Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina Fil: Yoshida, Maria Irene. Universidade Federal de Minas Gerais; Brasil Fil: Coelho Da Silva, Mercês. Universidade Federal de Itajubá; Brasil Fil: Stefani, Pablo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina Fil: Marcovich, Norma Esther. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
- Published
- 2013