Flexible cyanated phenylene sebacate oligomer (CPS) was prepared to characterize its cure kinetics and the gel point. A dynamic differential scanning calorimetry study revealed an apparent activation energy of 21.8 kcal mol-1 and first-order kinetics with rate expression Af(alpha) = 7.8 x 10(6)(1 - alpha)s-1. Gravimetric analysis revealed a gel point at alpha(gel) = 51%, close to the theoretical value of 50%. The accessibility of cyanate groups during cure of CPS resulted in a lower gel point as compared with that of a rigid aromatic dicyanate such as 2,2-bis(4-cyanatophenyl)propane.