engleski

PREPARATION AND CHARACTERIZATION OF POLY(METHYL METHACRYLATE)- SILICA HYBRIDS

The sol-gel process, with its associated mild conditions, offers a new approach to the synthesis of composite materials with domain sizes approaching the molecular level. For example, metal alkoxides can be mixed with monomers to be polymerized or polymers, which have functional groups that react with metal hydroxide, resulting in homogeneous organic-inorganic hybrid materials. In the hybrid materials, the existence of primary bonding forces (e.g. controllable number of covalent bonds) between the organic and inorganic components results in a reduced tendency of macroscopic phase separation as caused often by the thermodynamic incompatibility of the components. In this work hybrid materials for biomedical applications were studied. Poly(methyl methacrylate)-silica hybrids were prepared by a simultaneous polymerization of organic monomer methyl methacrylate ( MMA) and an organically modified silicon alkoxide, 3-glycidyloxypropyltrimethoxysilane (GLYMO), using a poly(oxypropylene)diamine as a crosslinking agent. Prepared hybrid materials were studied by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermogravometric analysis (TGA). Inorganic phase formed as a result of GLYMO´s hydrolysis and condensation in the sol-gel process influences the glass transition temperature of poly(methyl methacrylate) and improves the heat resistance of hybrid materials.

sol-gel; hybrids; PMMA; silica

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