Method of modifying a polymer composite

Abstract

The subject of the application is a method of modifying a polymer composite based on a matrix in the form of bisphenol A glycidyl dimethacrylate as Bis-GMA, triethylene glycol as TEGDMA and a filler in the form of silica modified with 3-methacryloxypropyltrimethoxysilane and a photopolymerization initiator in the form of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide as BAPO, irradiated with visible light with a wavelength in the range of 400 nm, characterized in that bis-[2-(methacryloyloxy)ethyl] phosphate as BMEP is added to the polymer matrix to obtain a mixture of monomers in a weight ratio of 40:30:30 and a photoinitiator in an amount of 0.5% by weight of the monomer mixture, and then a filler in the form of silane-modified silica with an average particle size of 0.4 µm, or a mixture of such silica. with an average particle size of 0.4 µm and 3 µm in a weight ratio of 1:1, in an amount corresponding to 25 to 70% of the total mass of the composite, after which the whole is thoroughly mixed,deaerated under vacuum and then exposed to visible light for no less than 2 minutes, with an intensity of 150 mW / cm2 and after a 7-day aging period, cured at a temperature equal to or above the glass transition temperature determined for each composite composition.,