Organically functionalized polysiloxane nanoparticles, method for the production thereof, and use thereof

摘要

The present invention relates to polysiloxane nanoparticles having the following properties: an average particle size d50 (measured using REM recordings) in the range of 10-200 nm, a specific surface area Ao of at least 50 m2/g, a pore volume of at least 0.2 cm3/g, an average pore volume d50 of at least 0.8 nm, wherein the particles have groups that contain carbon, which groups are bonded to the silicon at least partially in the form of unsubstituted or substituted alkyl, alkenyl, aryl, arylalkyl, or alkylaryl groups. Said polysiloxane nanoparticles can be produced, among other things, in that either a silazane or a mixture of different silazanes having one or more —[Si(R)(R1)—NR2]— units and/or a silane or a mixture of different silanes having the formula R′x—SiX4-a or an oligosiloxane obtainable by means of hydrolytic condensation of said silane/said silanes or a mixture of such oligosiloxanes are provided in a solvent and brought in contact with a strongly alkaline medium in such a way that the pH is not below 13 after the addition thereof. In specific embodiments, synthesis in acid is also successful.

主权项

1. Polysiloxane nanoparticles, prepared from silazanes or open-chained or cyclic polysilazanes in an alkaline environment, comprising:
an average particle size d50 (measured using REM recordings) in the range of 10 nm to 200 nm, a specific surface area Ao of at least 50 m2/g, a pore volume of at least 0.2 cm3/g and an average pore diameter d50 of at least 0.8 nm, wherein the nanoparticles have carbon-containing groups, at least some of which are bonded to the silicon in the form of unsubstituted or substituted alkyl or alkenyl groups, wherein the nanoparticles have a portion of, on average, a maximum of 3.5 carbon atoms per silicon atom and wherein to not more than 80% of the silicon atoms, more than one carbon atom is directly bonded, the nanoparticles being meltable.