Study of Fluoroalcohol Effects on SET-LRP
|Course||Polymer Chemistry and Physics|
|Keywords||Single- electron transfer living / controlled radical polymerization (SET-LRP) 1,1,1,3,3,3 - hexafluoro isopropanol (HFIP) Methyl methacrylate (MMA) Solvent effect Methacrylate propynyl ester (PgMA)|
\In 2006, Percec, who proposed a single electron transfer \body (such as vinyl chloride) polymerization catalyst with less, so other than \In this thesis, SET-LRP study mechanisms of polymerization for the purpose of specific study of (1) a fluorine alcohol solvent on the polymerization behavior; (2) under the action of fluoride alcohol solvent, initiator structure and the type of the polymerization of halogen; (3 ) fluoride presence of an alcohol, propargyl methacrylate ester (PgMA) The SET-LRP. Specifically concluded as follows: (1) 1,1,1,3,3,3 - hexafluoro isopropanol (HFIP) as the solvent a methyl methacrylate (MMA) / EBiB / Cu (0) / PMDETA single electron transfer system \Polymerization results are presented typical \Increasing the solvent (HFIP) concentrations, can improve the controllability of the polymerization, the initiator exhibit higher efficiency and more narrow molecular weight distribution. HFIP presence of the polymer can be achieved for the control of stereoregularity. High solvent (HFIP) concentrations and lower temperatures, may improve the stereoregularity of the polymer. The results show, HFIP as a SET-LRP solvent of PMMA can be achieved and the stereoregularity of the dual control. (2) with benzyl halide as initiator, MMA monomer through a single-electron transfer \Polymerization results are presented typical \The results showed that, HFIP presence can improve the controllability of polymerization bromide, in addition, also inspected the halogen initiator initiator properties on efficiency. (3) In RAFT agent: α-naphthoic acid isobutyronitrile dithio ester (CPDN) of modulators investigated HFIP solvent effect, in the absence of any group for protection conditions, to achieve the acetylenic monomers : methacrylate propynyl ester, (PgMA) The SET-LRP. Polymerization kinetics of the polymerization reaction is first displayed, and the molecular weight conversion of the monomers with the increase in linear growth. The polymerization conversion rate of less than 50% of the cases, the molecular weight distribution index of the controllable range, the ends of the polymer and a high degree of functionalization.