Structure–property relationships in bibenzoxazole polymers containing fluorocarbon linkages

摘要

AbstractA series of bibenzoxazole polymers with general formulawhere R′f and Rf are fluorocarbon‐containing linkages has presented a unique opportunity to determine relationships between physical transitions and molecular structure. The results of oscillatory thermomechanical experiments (∼1 Hz) show two glassy‐state and a glass transition as amorphous transitions for each material above −180°C. Each glassy‐state transition is correlated with onset of motion of specific linkages, the flexibilities of which depend on the structure and molecular positions of the linkages. The glass transition temperatures depend on the two relaxations (T