Synthesis Of New Fluorine-terpolymer By Polymerization Of Tetrafluoroethylene And Ethylene In The Presence Of A Third Monomer

The copolymerization of ethylene (E) and tetrafluoroethylene (TFE) in the presence of the third monomer was carried out with trichlorotrifluorethane as solvent, resulting in pure and white terpolymers. The structure and properties of the terpolymer were characterized using Fourier transform infrared spectroscopy(FT-IR), solid state carbon-13 nuclear magnetic resonance (13C-NMR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and polarizing microscope.We synthesis the copolymer of ethylene(E) and tetrafluoroethylene (TFE) in the presence of 3,3,3-trifluoropropene (TFP) in solvent trichlorotrifluoroethane(R113). The kinetics of polymerization were studied. Effect of polymerization temperature and amount of initiator or catalyst on rate was investigated. The apparent activation energy was found too.The DSC results revealed that the melting points of terpolymer decreased with increasing the molar ratio of the third monomer TFP. TGA curves showed that the terpolymers were decomposed at about 350℃and possessed of the high-temperature resistance. The polarizing microscope test result indicated that the crystalline morphology of the polymer was influenced by the content of TFP. Moreover, the copolymer still maintain excellent heat resistance and solvent resistance.Hexafluoropropylene (HFP) was also used as a third monomer, and we obtained tetrafluoroethylene / ethylene / hexafluoropropylene copolymer. The polymerization kinetics were studied to obtain data on the polymerization; the temperature of polymerization, initiator dosage, the monomer ratio and monomer concentration on the reaction were studied;The use of 1,1,2 - trichloro -1,2,2 - trifluoroethane (R113) and 1 - fluoro 2 - chloro-methane (R21) were used as an organic solvent for the polymerization reaction. Under this solution polymerization, it can effectively reduce the reaction pressure and improve the safety of the experiment; By a certain proportion of a mixed solvent of R113 and R21 , the melt index of the copolymer can be effectively regulated. The surface contact angle of copolymer film was determinated and the surface energy can be calculated by the surface contact angle. And the terpolymers have excellent solvent resistance.