ATRP Of Methyl Methacrylate In Solvothermal System

A new system to carry out ATRP was brought forward in this dissertation—Solvothermal system, and we will introduce the investigation of ATRP of methyl methacrylate in solvothermal system in the following chapters. The effects of reaction temperature, time, initiator and reductant on ATRP were investigated. After getting the Mn and polydispersity of the resulting polymers, the polymerization dynamic features were analyzed. The results shew that, the PMMA with lower dipersity (<1.19) at even easier polymerization conditions, lower polymerization temperature (80℃) and higher oxygen concentration (about 8－10-3 mol.L-1) were obtained from ATRP in solvothermal system than that obtained in normal methods. Further more, ATRP of methyl methacrylate in solvothermal system without reducing agent or initiator was performed, and the resulting PMMA also had some characteristics in common with living radical polymerization, we suggested the possible scheme of the reaction in such special conditions at the end of each chapter. At last, we performed the ATRP of other two functional polymers in solvothermal system.In our experiments we concluded that solvothermal synthesis was good candidates to carry out ATRP comparing with normal methods because it exhibits several obvious advantages:(i) due to the closed system, the solvothermal synthesis allow the operational process to be facile, effectively prevent the evaporation of toxic substances; (ii) easy to handle, simple to adjust atmosphere of the reaction, possible to make the heating temperature much higher than the solvent boiling point because of the high steam pressure in the system; (iii) the high temperature and pressure during the reaction can enhance solubility of inorganic compounds in organic solvent, such as the metal-salt catalyst of ATRP, reduce the negative impact of water, oxygen and other impurities on the reaction, and the solution viscosity decreases while diffusion and mass transfer process speed up; (iv) reprocess is much easier as lower boiling point solvent is always selected as reaction solvents.