Author/Authors :
Rueda، نويسنده , , L. and Saralegui، نويسنده , , A. and Fern?ndez d’Arlas، نويسنده , , B. and Zhou، نويسنده , , Q. and Berglund، نويسنده , , L.A. and Corcuera، نويسنده , , M.A. and Mondragon، نويسنده , , I. and Eceiza، نويسنده , , A.، نويسنده ,
Abstract :
Cellulose nanocrystals (CNC) successfully obtained from microcrystalline cellulose (MCC) were dispersed in a thermoplastic polyurethane as matrix. Nanocomposites containing 1.5, 5, 10 and 30 wt% CNC were prepared by solvent casting procedure and properties of the resulting films were evaluated from the viewpoint of polyurethane microphase separated structure, soft and hard domains. CNC were effectively dispersed in the segmented thermoplastic elastomeric polyurethane (STPUE) matrix due to the favorable matrix–nanocrystals interactions through hydrogen bonding. Cellulose nanocrystals interacted with both soft and hard segments, enhancing stiffness and stability versus temperature of the nanocomposites. Thermal and mechanical properties of STPUE/CNC nanocomposites have been associated to the generated morphologies investigated by AFM images.
Keywords :
Polyurethane , Hard and soft segments , crystallization , atomic force microscopy , Cellulose nanocrystals
