| 초록 |
Although the anionic ring-opening oligomerization of hexafluoropropylene oxide (HFPO) in the presence of alkali metal fluoride is the well-known industrial process to produce perfluoropolyether (PTFE), there is few studies on the kinetical aspect of HFPO oligomerization systemically. The present study aims at giving simple experimental conditions to prepare moderate molar mass PFPE (Mn 1000~2000) without using harmless reactants such as cesium fluoride and 1,1,2-trifluorotrichloroethane. An extensive investigation of the oligomerization of HFPO using the potassium fluoride/tetraethylene glycol dimethyl ether system with the continuous addition of gaseous monomer is carried out, looking specifically into the influence of the temperature, nature of alkali metal fluorides, and solvents on the polymerization mechanism and the molecular mass of final PFPE products. The number-average molecular weight of synthesized oligomers is calculated from 19F-NMR spectroscopy. |
