METHOD FOR GRAFTING POLYSILOXANES ON SURFACES OF PHOTOCATALYTIC METAL OXIDES, POLYSILOXANE-GRAFTED METAL OXIDE SURFACES AND APPLICATIONS THEREOF

摘要

The present invention relates to a method for grafting polysiloxanes on surfaces of photocatalytic metal oxides by light illumination which comprises at least the following steps:a) providing a surface of a photocatalytically active metal oxide;b) providing a polysiloxane or a mixture of polysiloxanes on the metal oxide surface;c) irradiating the reaction mixture with light in a wavelength range from 180 nm to 550 nm for a sufficient time to generate reactive moieties in said polysiloxanes and to form covalent Si-O-Me (Me = metal) bonds between said reactive moieties of the polysiloxanes and the metal oxide surface;d) optionally separating unreacted polysiloxane molecules from the polysiloxane-grafted metal oxide surface;wherein no silane coupling agent or cross-linking agent needs to be present in the reaction mixture and/or participates in said grafting reaction.;A further aspect of the invention relates to the hydrophobic and photocatalytically active polysiloxane-grafted metal oxide surface obtainable by said method and to articles comprising said surface.