A method of synthesizing hybrid core-shell microparticles comprising a polymer core and a controlled-surface silica shell

摘要

A method of controlling a skin roughness factor of hybrid core-shell microparticles comprising a polymer core comprising a styrene and a silicate shell surrounding the polymer core, comprising: - providing the polymer core with a polyvinylpyrrolidone; - forming the silicate shell surrounding the core; Volume of TEOS is set to a used mass of the polymer cores of at least 3: 1, wherein the roughness factor is defined as the quotient of an identifiable for the adsorption of nitrogen from an isotherm external surface of the hybrid core-shell microparticles and a surface, starting from a arithmetic mean particle diameter of the hybrid sphere considered as an ideal sphere microparticle is calculated, wherein the roughness factor is set in dependence on an average molecular weight of the polyvinylpyrrolidone targeted, so that the roughness factor- lie between 1 and 1.5 lie t, when the average molecular weight of the polyvinylpyrrolidone is 10,000 daltons; and between 1.51 and 3 when the average molecular weight of the polyvinylpyrrolidone is 40,000 daltons.