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The Polymerization of Fluoro Olefins in New Emulsion Systems

Author: ZhangLuQing
Tutor: ZhangShuXiang
School: Jinan University
Course: Polymer Chemistry and Physics
Keywords: Fluorine - containing surface active agent Surface tension Interfacial tension Critical micelle concentration Tetrafluoroethylene Ethylene Alkyl vinyl ether Fluorinated latex
CLC: TQ316.334
Type: Master's thesis
Year: 2010
Downloads: 26
Quote: 0
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Abstract


Synthesized under different experimental conditions, fluoro-hydrocarbon surfactants. The study of the reaction conditions on product yield using Fourier transform infrared (FTIR), NMR spectroscopic methods (19FNMR, 1HNMR) were characterized by their molecular structure. By thermal gravimetric analysis, showing the different degrees of thermal stability, decomposition starting temperature: 229 ° C, the end of the decomposition temperature: 574 ° C, such fluorine-containing surface active agent having good thermal stability. And the surface tension of its aqueous solution, with cyclohexane interfacial tension and its critical micelle concentration (conductivity and surface tension method) and other performance of the quantitative determination; The results show that the resulting fluorine-containing surface active agent having a low surface Tension: 21.63mN / m; interfacial tension: 4.03 mN / m; low critical micelle concentration: 7.64 × 10 - 5 mol / L, at the same time. Fluorocarbon chains of different lengths and theoretically investigated the influence of the right surfactant properties, interfacial tension rising trend to a decreasing trend, the surface tension and the critical micelle concentration with the growth of the fluorocarbon chains. Theoretically calculated saturated adsorption amount of water at 25 ℃ (Γ ∞) were: 1.23 × 10-10mol · cm -2 , surfactant individual molecules share of the average area (As), respectively for: 1.35nm 2 . Tetrafluoro-ethylene (TFE), ethylene (E), trifluoropropene (TFP), and an alkyl vinyl ether as main raw material, preparation of a homopolymer, a binary copolymer and terpolymers containing copolymer emulsion. Research and polymerization conditions on the emulsion polymerization and emulsifier on the emulsion polymerization and emulsion nature. Laser particle size analysis instrument (LPS), Fourier transform infrared (FTIR), scanning electron microscopy (SEM) the NMR (19FNMR, 1HNMR), and differential scanning calorimetry (DSC) as the main analytical tools, fluoropolymer emulsion the analysis and characterization. In order to get the fluorinated latex formulations and the best experimental conditions. The experiment focused on monomer ratio, initiator of the amount of emulsifier, and the reaction temperature carefully. Experiments to determine the the fluorinated latex optimum conditions. Fluorine-containing polymer emulsion synthesized under different polymerization conditions and then on the emulsion stability, the particle size of the latex particles, polymer films and the water contact angle and latex particles of particle morphology of the polymer was measured to study its response characteristics. When the emulsifier content is 1% -9% of the total monomers, and can be a stable performance of the fluorine-containing emulsion was prepared. Decreases and then increases the particle size of the latex particles with the increase of the amount of emulsifier, a minimum particle size of the latex particles when the amount of 5%, the performance of the emulsion, indicating that when the latex particles becomes, latex The particles can be stably present.

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Production process > Polymerization process. > By method of sub- > Emulsion polymerization
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