The Reasearch Of Ratrp Of Styrene In Microemulsion

Reverse atom transfer radical polymerization (RATRP) is a new living/controlling characteristic radical polymerization. In recent years, the research1 on ATRP is popular which is most on new initiate-catalyze system, new monomer, new polymer structure, and polymerization mechanism and dynamics. Combine ATRP with microemulsion polymerization, we can get micropaiticle with controlled structure.In this paper, the reverse atom transfer radical polymerization of styrene in microemulsion was studied and microparticle with controlled structure was prepared. The main researches were focused on such aspects as the preparation of microemulsion of styrene, the investigation of RATRP of styrene in microemulsion, the effect of different mol ratio of AIBN/CuCl2/bpy, the electrolyte, the initiator and the catalyst on the polymerization, the research of the structure of obtained polymer particles, and the copolymerization of PSt with MMA.The RATRP of styrene in microemulsion was studied by measuring the conversion of reaction and molecular weight of the obtained polymers. The conversion was determined by means of weight. The molecular weight is measuredby viscosity method and gel permeation chromatography. When the mol ratio of AIBN/CuCk/bpy is 1:3:6 the polymerization can be controlled at certain degree. When small molecular electrolyte was added into the system and the effect of, controlling get better, and when the amount of NaCl or NaBr reaches 1.0% to water, the reaction can be controlled very good, but the final conversion of system is low. The structure of polymers was analyzed by NMR and IR. The result shows that there was a -Cl group on the polymer chains. The results of transmitting electron microscope and scanning probe microscope observation shows that the obtained particles were sphere in shape and is no more than 80 nm in diameter. The mechanism of reaction was researched by determining the content of Cu2+ in the water through ultraviolet-visible light spectrophotometer. When KPS or BPO were used as initiator the controlling is bad. When FeCh-PPhs was used as catalyst system the reaction was also can not be controlled. Using the obtained polystyrene as macromolecular initiator, a block copolymer (PSt-b-PMMA) can be obtained. These researches founder the functional polymer to realistic product.