Khoroshavina Y.V.,Lebedev Synthetic Rubber Research Institute |
Eliseev O.A.,Moscow Aviation Institute |
Nikolaev G.A.,Lebedev Synthetic Rubber Research Institute
Polymer Science - Series D | Year: 2014
New fluorosiloxane cold-curing-sealant compositions based on low molecular weight poly[dimethylmethyl(hexafluoroalkyl)siloxane] rubbers of Russian production were developed. It was shown that the compositions meet the specification requirements for a serial VGF-2 sealant and possess improved resistance to TS-1 fuel. © 2014 Pleiades Publishing, Ltd.
Chernyavskii G.G.,Lebedev Synthetic Rubber Research Institute |
Emel'yanov G.A.,Lebedev Synthetic Rubber Research Institute |
Purtseladze V.I.,Lebedev Synthetic Rubber Research Institute |
Osetrova L.V.,Lebedev Synthetic Rubber Research Institute
Russian Journal of Applied Chemistry | Year: 2015
Radical copolymerization of vinylidene fluoride (1,1-difluoroethylene), hexafluoropropylene (hexa-fluoropropene-1), and perfluoroallyl fluorosulfate (fluorocopolymer C26-FS) was performed in a solution of 1,1,2-trifluoro-2,2,1-trichloroethane in order to create new low-molecular functional fluorocopolymers for cold vulcanization. The optimal copolymerization conditions were determined and a relationship was revealed between the microstructure of the C26-FS fluorocopolymer and its physicomechanical characteristics. 19F NMR spectroscopy was used to identify the structure and determine the number-average molecular mass and composition of the synthesized fluorocopolymers with a fluorosulfate group. The thermal stability in an inert medium and the glass transition temperature of S26-SF and the physicomechanical properties of their vulcanizates were studied. It was shown the properties and vulcanization duration of low-molecular functional fluorocopolymers is affected by the content of perfluoroallyl sulfate units (f = 2-4) relative to the vinylidene fluoride and hexafluoropropylene units in the polymer chain. © 2015 Pleiades Publishing, Ltd.