Flexible polyurethane foams based on 100% renewably sourced polyols
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2014-10-5Autor
Ugarte Soraluce, Lorena
Saralegui Otamendi, Ainara
Fernández Salvador, Raquel
Martín Alberdi, María Dolores
Corcuera Maeso, María Ángeles
Eceiza Mendiguren, María Aranzazu
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Industrial Crops and Products 62 : 545-551 (2014)
Resumen
Since polyol is one of the major components in polyurethane foam synthesis, introducing renewably
sourced polyols in the foam formulation leads to materials with high renewable carbon content. A series of
flexible polyurethane foams with variations in polyol composition were synthesized with castor oil based
Lupranol Balance® 50 polyether polyol and corn based polytrimethylene ether glycol mixtures. Water was
used as the unique and eco-friendly blowing agent. The effect of the relative amount of each polyol on the
structure and properties was analyzed by optical microscopy, Fourier transform infrared spectroscopy,
thermogravimetric analysis, tensile and compressive tests, dynamic mechanical analysis and atomic force
microscopy. The average molecular weight and hydroxyl number of the polyol components showed to
influence the foaming reaction and hence the structure and properties of the polyurethane foam. The
newly developed peak force quantitative nano-mechanics technique was used to map the elastic modulus
values of foam cell struts and it seemed to be adequate to assess the purity of the different phases