Polymers from Multifunctional Isocyanates, 15

Abstract

N‐(4‐cyanatophenyl)maleimide and 2‐isocyanato propene were copolymerised to give an alternating copolymer, which is the first example of a polymer having an isocyanate as well as a cyanate reactive functional group in the repeating unit. The polymer analogous reaction with methanol proceeded selectively at the isocyanate groups. Crosslinking of the cyanate‐urethane copolymers by cyclotrimerisation of cyanate groups occurred at elevated temperature. Reaction with dibutylamine at 20 °C led to complete reaction of both the cyanate and isocyanate moieties in a non‐selective manner.magnified image