Heat Stable Polymers: Polyquinolines and other Aromatic Polymers.
Final rept. Jan 77-Dec 79,
COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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Polyquinolines can be synthesized by an acid catalyzed polymerization reaction that allows a variety of structural modifications, resulting in a range of chain stiffness that can be altered from a relatively flexible amorphous polymer with a moderately low glass transition temperature 250 deg C to a rod-like molecule with a high degree of crystallinity and a high crystalline transition temperature 550 deg C. Fibers can be spun and films cast from solution. The rigid rod polyquinolines form anisotropic solutions and, as a result, produce crystalline fibers with a high degree of orientation and a high modulus. A series of polyquinolines containing biphenylene units in the main chain were prepared in order to effect crosslinking reactions of these materials. Crosslinking took place thermally, above the Tg of the polymer, to give insoluble polymers with higher Tgs and higher moduli both above and below Tg. Transition metals catalyze the crosslinking reactions, allowing lower curing temperatures. Polyaramides, polybenzimidazoles and polyquinoxalines could be similarly crosslinked by incorporating biphenylene into these polymers. Author