Authors: F. Bondioli, A. Dorigato, P. Fabbri, A.M. Ferrari, M. Messori, A. Pegoretti
Affilation: Università di Modena e Reggio Emilia, Italy
Pages: 719 - 722
Keywords: nanocomposite, HDPE, titania
Titania nanoparticles were prepared by both hydrolysis of tetraethoxy titanium, in order to obtain a spherical shape, and by hydrothermal crystallisation. Nanoparticles were also surface modified with alkylsilanes in order to improve the compatibility with organic polymers. The obtained powders were fully characterized in order to define their physical and chemical properties. HDPE/TiO2 composites were prepared by melt mixing and were mechanically characterized. The presence of titania nanoparticles (in a concentration range of 1-5%vol) led to a significant increase of elastic modulus together with a slight increase of yield stress and a decrease of ultimate elongation. An interesting decrease of creep compliance for both elastic and viscoelastic components was also evidenced. Finally, HDPE-based composites containing commercial titania having dimension in the micrometer scale were prepared and characterized for comparison.