| Abstract: | Linear polymers were prepared by the condensation of bis(dimethylamino)dimethylsilane and 1,4-bis(dimethylaminodimethylsily)benzene with fluorocarbon diols. 1,5-Dihydroxy-3-methyl-1,1,5,5-tetrakis(trifluoromethyl)-2-pentene, the cis addition product of hexafluoroacetone and isobutylene, with the silylbenzene monomer gave a polymer that cured at room temperature to a rubber exhibiting a glass transition temperature of 0°C, low swelling in hydrocarbons, and excellent resistance to hydrolytic, oxidative, and thermal degradation, retaining its flexibility after exposure to air for 3 hr at 305°C. The polymers obtained by condensing 1,5-dihydroxy-1,1,5,5-tetrakis(trifluoromethyl)-2-pentene, the trans addition product of hexafluoroacetone and propylene, with the silylbenzene and the silane monomers had glass transition temperatures of ?12 and ?50°C respectively, and greater resistance to swelling in hydrocarbons. |
