ZnO NANOPARTICLES AND NANOWIRES WITH ORGANOPHILIC SURFACE AND THEIR NANOCOMPOSITES WITH POLYMETHYL METACRYLATE

摘要

The subject of the invention are nanoparticles and nanowires of zinc oxide (ZnO) with organophylic surface, synthesised in various diols in the presence of para-toluene sulphonic acid (p-TsOH), and their nanocomposites with polymethyl metacrylate (PMMA), prepared without additional modification of ZnO particle surface. The procedure of preparation of nano-ZnO is carried out by hydrolysis of a zinc compound in various diols in the presence of para-toluene sulphonic acid as catalyst and comprises the following steps: mixing and sonification of the solution for 5 to 60 minutes; heating of the solution for 30 to 90 minutes at temperatures between 100 and 300 degrees Celsius; settling of the zinc oxide compound for up to 24 hours; separation of the suspension from the precipitate; washing of the suspension; drying of the suspension. The preparation of nanocomposites composed of a metacrylic or acrylic polymer and unmodified nano-ZnO consists of the following steps: preparation of the mixture of a metacrylic or acrylic monomer, initiator and zinc(II) oxide; mixing and sonification for 5 to 60 minutes; optionally partial polymerisation of MMA; optionally repeated addition of 0.1 to 40% of the initiator; transfer into a mould; polymerisation at a temperature between 35 and 80 degrees Celsius; cooling down of the polymer and its separation from the mould.