Comfort and fatigue performance of a Soya-derived flexible PU foam for mattresses

In this work, a sustainable soy-derived PU flexible foam for mattresses has been characterized in terms of structural, thermal and mechanical properties, and submitted to cyclic fatigue tests, in order to investigate its cyclic fatigue performance. The bio-foam, tested before and after 120000 cycles fatigue loading, shows both a thickness loss and significant changes in morphology, with a structural breakdown of the cell walls, and in the mechanical parameters related to comfort (i.e. hysteresis loss, surface firmness and sag factor), but it maintains substantial resistance to bottoming out as the load is applied.In this work, a sustainable soy-derived PU flexible foam for mattresses has been characterized in terms of structural, thermal and mechanical properties, and submitted to cyclic fatigue tests, in order to investigate its cyclic fatigue performance. The bio-foam, tested before and after 120000 cycles fatigue loading, shows both a thickness loss and significant changes in morphology, with a structural breakdown of the cell walls, and in the mechanical parameters related to comfort (i.e. hysteresis loss, surface firmness and sag factor), but it maintains substantial resistance to bottoming out as the load is applied.