No abstract

A polyquinoline containing a bipyridyl link in the polymer backbone was coordinated to a ruthenium center to form a tris(bipyridyl)ruthenium complex. The polymer and corresponding model complexes were characterized and then assessed for its photosensitizing ability. The model, 3, and dissolved polymer 4 both sensitized the photoreduction of methyl viologen in a sacrificial system. The polymer was then examined for its suitability as a photosensitizing membrane in a water photolysis cell.

It has been discovered that a combination of heat and high‐power ultrasound can be used to initiate ring‐opening polymerization in cyclic bisphenol A polycarbonate oligomers. The polymerization can be conducted with or without the use of added chemical initiators. The use of ultrasound was extended to prepare glass‐filled composites. © 1993 John Wiley & Sons, Inc.

SynopsisGraphite-reinforced composites were prepared with oligomeric polyimides having biphenylene end-caps and acetylene linkages in the polymer chain. The oligomers were crosslinked by the reaction of the biphenylenes with the diphenyl acetylenes to form 9,lO-diphenylphenanthrene units. The resulting composites had good mechanical properties. Thermal oxidative aging studies show that the unidirectional graphite fiber composites maintained good mechanical properties up to 1200 h at 316OC.

The two Ru complexes (VII) and (XI) containing the novel ligand (III), are synthesized according to the scheme.