The OIT value of the NR with GM-ME-IPDI is 61.9 min, lower than that with GM-ME, which can be attributed to the lower antioxidative moieties content. What is exciting is that, the OIT value of the NR with GM-ME-TDI reaches to be 77.4 min, has a much increase than that with GM-ME-IPDI, and is also higher than that with GM-ME. The reasonable explanations are that the urethane group functions as an antioxidative group, and the urethane group connected with benzene ring has better antioxidative ability than the urethane group connected with the alicyclic ring.