Accession Number : AD0480181
Title : POLYMERIZATION STUDIES LEADING TO HIGH STRENGTH CHEMICAL RESISTANT ELASTOMERS SERVICEABLE AT TEMPERATURE EXTREMES.
Descriptive Note : Semiannual rept. no. 2, 1 Jun-30 Nov 65,
Corporate Author : UNITED STATES RUBBER CO WAYNE NJ RESEARCH CENTER
Personal Author(s) : Relyea, D. I. ; Smith, H. P. ; Johnson, A. N.
Report Date : 15 DEC 1965
Pagination or Media Count : 33
Abstract : The screening of potential catalysts for the polymerization of fluorinated olefins and dienes has been continued. The olefins investigated include vinylidene fluoride, hexafluoropropylene 1,1,2-trifluorobutadiene, hexafluorocyclobutene, 1,2-dichlorohexafluorocyclopentene and 1,1,2-trifluoro-2-chloro-3-ethynyl-3-methylcyclobutane. Copolymerizations of these with ethylene, with butadiene, or among themselves were studied. 1,1,2-Trifluorobutadiene can be polymerized with Ti(OBu)4-Al(i-Bu)3 catalyst and copolymerized with butadiene with the same catalyst or with TiI4-Al(i-Bu)3. 1,1,2-Trifluoro -2- chloro -3- ethynyl -3- methylcyclobutane can be polymerized with TiCl4-Al(i-Bu)3 catalyst. Hydrocarbon solvents are much preferable to halocarbon solvents for these polymerizations. Only low conversions were obtained in polymerizations of fluorinated acyclic olefins with electron-rich catalysts. Ring-opening polymerizations of fluoronated cyclic olefins with catalysts based on V, Ti, Mo, W, Cr, Rh or Ru have not been achieved. (Author)
Descriptors : *HIGH TEMPERATURE), (*POLYMERIZATION, (*ELASTOMERS, HEAT RESISTANT MATERIALS), FLUORINATION, DEGRADATION, TRANSITION METALS, HYDROCARBONS, DIENES, CYCLOBUTENES, CYCLOPENTENES, CYCLOBUTANES, CATALYSIS, COPOLYMERIZATION, CHEMICAL PROPERTIES, SOLVENTS, ALKENES, IONS.
Subject Categories : Inorganic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE