the best mode of practicing the invention and yet are not intended as limits to said process in these examples all proportions and percentages are on a weight basis unless otherwise indicated a triazine elastomer was prepared using the u03b1 u03c9 dinitrile of a perfluoroalkylene oxide as a starting material the dinitrile had the following formula str2 wherein m n 6 the dinitrile 33 84 g was placed into a three neck flask connected to a dewar condenser and to sources of nitrogen and ammonia gas the system was purged with nitrogen for ten minutes ammonia gas was introduced under reflux conditions for 3 hours and 35 minutes the ammonia was then vented and the flask sealed for 3 days with some ammonia remaining in it a viscous polymer was obtained having an intrinsic viscosity of 8 25 ml g and a ratio of ir absorbancies at 1600 cm 1 2260 cm 1 of 41 the viscous polymer was dissolved in freon 113 1 1 2 trichlorotrifluoroethane this solution was added slowly over a period of 15 to 20 minutes to an amber bottle containing 11 4 g trifluoroacetic anhydride more anhydride 2 0 g was placed in the flask to complete ring closure and this was left standing overnight the freon 113 was then removed by distillation leaving a residue which separated into layers the upper layer mainly composed of trifluoroacetic acid was removed with a pasteur pipette and the remaining material was placed in a vacuum oven at 90 u00b0 c for 2 hours the linear polytriazine thus obtained weighed 35 92 g and.