Nanosilica-polyurethane interactions evidenced by plate-plate rheology and dmta

J. M. MARTÍN MARTÍNEZ, P. VÁZQUEZ, J. VEGA BAUDRIT, V. NAVARRO BAÑÓN

MACROMOLECULAR SYMPOSIA

WILEY

Año: 2005 vol. 221 p. 1 - 12

1022-1360

Fumed nanosilicas with various silanol groups percent were added in thermoplastics polyurethanes (TPU?s) to increase the rheological and mechanical properties. The higher the silanol content of the nanosilica showed the higher the storage modulus and the stability against the temperature of the nanosilica-TPU composite. DMTA experiments also confirm the degree of interactions between the TPU and the nanosilicas with different silanol content. Addition of nanosilica decrease the area under the tan d curve, as a consequence of a greater degree of crosslinking in the TPU produced by the nanosilica.  Therefore, the silanol content in the silica determinates the rheological behavior of nanosilica-TPU composites