Synthesis And Controlling Of Covalent Bonded PMMA/CaCO₃/SiO₂ Composite Particles

The goal of the thesis work was to develop a technique for the synthesis of well-defined multi-components composite particles, i.e. poly(methyl methacrylate)/calcium carbonate/silicon dioxide (PMMA/CaCO₃/SiO₂) three-component composite particles, through combining the polymer/inorganic composite technique with the inorganic/inorganic composite technique. This is accomplished by first synthesizing CaCO₃/SiO₂ two-component composite particles and grafting poly(methyl methacrylate) from the surface of these particles via in-situ emulsion polymerization. To control the structure of polymer segments, atom transfer radical polymerization (ATRP) was introduced to the synthesis of PMMA/CaCO₃/SiO₂ three-component composite particles. Using well-defined PMMA/CaCO₃/SiO₂ as macro-initiator, ATRP of methyl methacrylate and styrene in the presence of copper(I) bipyridine complexes was carried out to prepare block copolymer/ CaCO₃/SiO₂ multi-component composite particles. The main conclusions are as follows:(1) CaCO₃ particles were synthesized by reaction of CO₂ with Ca(OH)₂ aqueous suspension through ultrasonic irradiation. The factors affecting particle size of CaCO₃ were studied in detail. Increasing ultrasonic output power, decreasing the reaction temperature and increasing CO2 purging rate result in...