“Synthesis and characterization of functionalized silicas fillers on polymeric systems

L. MUSANTE, A. C. TURALLAS, G. ROMANELLI, P. VÁZQUEZ

Cancun, Mexico

Congreso; XIII International Materials Research Congress 2004; 2004

  In the field of polymeric systems an important goal is to reinforce the polymer matrix and to improve mechanical and thermal properties. Inorganic additives are introduced into polymer systems as fillers or as reinforcing agents. Among the inorganic materials, the silica receives considerable interest because different degrees of hydrophobic/hydrophilic are determining its dispersion in the polymeric matrix. The silica can have hydrophobic properties when its surface is functionalized. This process requires the presence of silanol groups at the surface. There are many types of silica differing in their surface properties, in particular, the density of silanol groups and the types of silanols (isolated, hydrogen bonded, geminal) vary by techniques of preparation of silica. The purpose of this investigation is to know the grafting process on silica prepared by sol-gel technique with reference to the same process on commercial silica. The principle of the investigation work consist in comparing the grafting of anilines, with different active groups (scheme 1), on both silica to obtain different surface degree of hydrophobicity. For a better understanding of these solids, the characterization of nature species were determined by FT-IR, XRD, DTA-TGA and surface area (SBET).