Contact
    Start Publications Layer-by-layer-assembled chitosan/phosphorylated cellulose ...
    ←  Publication Finder
    QSense

    Layer-by-layer-assembled chitosan/phosphorylated cellulose nanofibrils as a bio-based and flame protecting nano-exoskeleton on PU foams

    Year: 2018

    Journal: Carbohydr. Polym., Volume 202, DEC 15, page 479–487

    Authors: Carosio, F.; Ghanadpour, M.; Alongi, J.; Wagberg, L.

    Keywords: Layer-by-layer; Chitosan; Phosphorylated cellulose nanofibril; Polyurethane foams; Thermal stability; Flame retardancy

    The layer-by-layer (LbL) assembly of chitosan (CH) and phosphorylated cellulose nanofibrils (P-CNF) is presented as a novel, sustainable and efficient fire protection system for polyurethane foams. The assembly yields a linearly growing coating where P-CNF is the main component and is embedded in a continuous CH matrix. This CH/P-CNF system homogenously coats the complex 3D structure of the foam producing a nano-exoskeleton that displays excellent mechanical properties increasing the modulus of the foam while maintaining its ability of being cyclically deformed. During combustion the CH/P-CNF exoskeleton efficiently prevents foam collapse and suppresses melt dripping while reducing the heat release rate peak by 31% with only 8% of added weight. The coating behavior during combustion is investigated and correlated to the observed performances. Physical and chemical mechanisms are identified and related to the unique composition and structure of the coating imparted by the LbL assembly.
    View publication