AbstractThe thermomechanical behavior (−180° to 500°C) in nitrogen is reported for two fluorocarbon bibenzoxazole homopolymers and a corresponding copolymer. The dynamic mechanical spectra were generated at low frequencies (∼1 Hz) by an adaptation of the torsional pendulum, torsional braid analysis (TBA), which uses polymer/glass braid composites as specimens. The effects of the variations in molecular structure on physical transitions and thermal stability are discussed. Of particular interest are the specific submolecular assignments for the two glassy‐state transitions(T展开▼
