AbstractNew biscyanamides containingo‐substituted groups or a phenyl‐ether linkage were synthesized. The curing reaction behaviors of the biscyanamides were investigated. All the prepared biscyanamides began to polymerize as soon as they melted after being put on a heated plate beyond a certain temperature. The cured resins of each biscyanamides were prepared on the optimal conditions. Optimal conditions for cured resins were obtained from the curing reaction behaviors of each biscyanamide by differential scanning calorimetry (DSC). The effect of chemical structures of the biscyanamides on the thermal and mechanical properties of the cured resins such as seen by thermal gravimetric analysis (TGA), density, and flexural strength were studied. The introduction of alkyl groups into theorthoposition decreased intermolecular interactions. The introduction of a long phenyl‐ether linkage into the structure gave a broad exothermal peak in the DSC and good workability for the preparation of the cured resins. Moreover, the extension between cross‐linkings improved the flexibility of the cured resins. The cured resins with fluorine‐containing substituent groups also had better thermal stability in the air compared with hydrocarbon gro
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