Resins and Radomes Including Them

A prepreg comprising a plurality of plies coupled to each other, in which at least one of the plurality of plies comprises a substrate and a cyclically strained alkene effective to polymerize by ring opening metathesis polymerization in the presence of a catalyst to provide a resin, in which the resin comprises a dielectric constant of less than 2.7, a loss tangent of less than 0.003 and a moisture absorption of less than 1.5%.

A resin comprising a cyclically strained alkene effective to undergo ring opening metathesis polymerization in the presence of a catalyst to provide a polymeric resin with a dielectric constant of less than 2.7, a loss tangent of less than 0.003 and a moisture absorption of less than 1.5%, wherein the cyclically strained alkene is a compound of formula (I)

• in which R1, R2, R3 and R4 of formula (I) may each independently be hydrogen or a hydrocarbon group comprising 1 to 10 carbon atoms, R1 and R4 of formula (II) may each independently be hydrogen or a hydrocarbon group comprising 1 to 10 carbon atoms and R5 may be —CH2, oxygen, a secondary amine or a tertiary amine, or R1 and R4 of formula (III) may each independently be hydrogen or a hydrocarbon group comprising 1 to 10 carbon atoms or mixtures of formulae (I) through (III).