A new epoxide of β-(2

3)-epoxypropoxyethyl nitrate was prepared

characterized and polymerized with BF3Et2O-HO(CH2)4OH as a catalyst system to yield a new homo-polymer and a new copolymer with tetrahydrofuran. These prepolymers are viscous oil having reactive hydroxyl groups which are readily vulcanized with toluene diiso-cyanate and 1

2

6-trihydroxyhexane in the presence of a small amount of ferric acetonyl acetonate to produce rubbery elastomers with rather good elasticity in low temperature.