A Study Of Activator Generated By Electron Transfer Atom Transfer Radical Copolymerization Of Fluorinated Acrylate Copolymer In Aqueous Media

Activator generated by electron transfer atom transfer radical polymerization (AGET -ATRP) not only has the characteristics of atom transfer radical polymerization (ATRP) possess the "living/controlled", while AGET-ATRP polymerization also removal the oxygen from reaction system by adding reducing agent, that will further enhance the response to controllable and practical industrial production conditions. Therefore, this paper use AGET-ATRP of acrylate ternary polymerization of polymer products can be obtained directly applied to the development of industrial coatings. Study chooses methyl methacrylate (MMA), hexafluorobutyl acrylate (HFBA), butyl acrylate (BA) as monomer, screening for proper catalyst system, with AGET ATRP realization of fluorinated acrylic acid in emulsion. First, has researched the bulk polymerization reaction in different temperature, dosage of initiator, different dosage of ligand and different amount of reducing the influence of polymerization of fluorinated acrylic acid in AGET-ATRP polymerization. Second, has researched the polymerization of emulsion, scattered in different medium temperature, initiator, and emulsifier ligands on polymerization influence to study fluorided acrylic acid emulsion polymerization in the AGET ATRP. Finally, using high performance gel permeation chromatography (GPC) determined the actual molecular weight (Mn) and molecular weight distribution (PDI), using infrared spectroscopy (IR) and nuclear magnetic resonance spectroscopy (1H-NMR) to characterize the structure of the copolymer and composition. Further has researched the various factors on AGET ATRP preparation of fluorinated acrylic acid polymerization reaction.In the bulk polymerization reaction was studied different temperature, dosage of initiator, the ratio of the catalyst ligands with different dosage of reductant, and on the polymerization reaction. The study found that the polymerization rate is rising while the temperature increased but the polymerization reaction speed control reduced. The polymerization rate is rising while the dosage of initiator increased, and the polymerization reaction speed control reduced. The polymerization reaction rate is increasing while the reducing agent increased, but also reduce the controllable. When [CuBr2]/[Sn(EH)2]=(1:1) the smaller reaction rate, the reaction process control, when the ratio (1:5) the rate of polymerization, controllable. But the polymerization process, monomer concentration, ln([M]0/[M]) on the reaction time curves are good linear relationship, and polymer molecular weight with actual monomer and decreases. This shows the polymerization reaction with the basic characteristics of polymerization active, and molecular weight distribution of the copolymer narrow molecular weight and theory and practice of deviation smaller.In the emulsion, firstly, to study the different temperature, the influence of polymerization process with temperature increasing, but the polymerization reaction process control. Secondly, the dosage of emulsifiers and emulsifier and emulsion polymerization rate stability, found 2%compound emulsifier to polymerization, using SDS/Tween-80 (2:1) do not only with emulsifier, better control polymerization process, and the reaction rate increase dosage, 2% compound emulsifier wt % in about 3.5 emulsion stability of the system, the effect is good. Again, in the research of different initiator and ligand, bpy as ligands and bromination vision of butyl butyrate, as the initiator of the actual molecular weight polymer synthesis closer in theory, and molecular weight distribution of narrow (PDI<1.5)IR and NMR spectroscopy analysis of hydrogen was found by AGET-ATRP polymerization obtained ternary structure of fluorinated acrylic acid a variety of relevant characteristics of groups. IR spectra of the major functional groups, such as: 964cm-1 office has the characteristic absorption peak of n-butyl, 990cm-1 office has characteristic absorption peak of methyl, 610cm-1 absorption peaks occur-CF3; by 1H-NMR characterization of theδ4.36 department has HFBA chains in the-CHF-group, and the peak area calculated by the product composition of copolymer of methyl methacrylate (MMA): butyl acrylate (BA): hexafluoro butyl acrylate (HFBA ) = (22.56 / 3): (4.32/2): (2.26/2) = 6.65:1.91:1.00 and quality of raw material ratio (7:2:1).