Disordered and oriented polyacetylene-block-polynorbornene-block-polyacetylene

Advanced syntheses and microfabrications of conjugated polymers, C60-containing polymers and carbon nanotubes for optoelectronic applications

“…Polyacetylene prepolymers with a wellcontrolled molecular weight and a distribution close to unity have been prepared by a refined Durham route [342±344]. Furthermore, it is now possible to synthesize end-functionalized polyace- tylene chains [345,346] and to produce block copolymers with well-defined polyacetylene phase structure through the Durham route [347,348]. An alternative precursor route to polyacetylene, which differs from the Durham route in that there is no mass loss upon thermal conversion, was also reported (Scheme 16) [349].…”

Synthesis and characterization of a liquid crystalline polyacetylene with cholesteryl side groups using Schrock-type molybdenum initiators

“…In order to overcome these problems and to synthesize oriented samples of polyacetylene, two main approaches are found in literature. The first one is the preparation of oriented polyacetylene via precursor polymers 7) which can be oriented during the conversion to the final polyacetylene [8][9][10][11][12][13] . Alternatively, the use of specially treated catalysts followed by orientation of the films by the application of mechanical force has been reported 14,15) .…”

Ring opening metathesis polymerization of dicyclopentadiene catalyzed by titanium tetrachloride adduct complexes with nitrogen-containing ligands

“…Ring opening metathesis polymerization (ROMP) of cyclic unsaturated hydrocarbons has been studied extensively over the past several decades1–5 following the first report made by Eleuterio6 and the famous discovery of homogeneous catalyst by Natta and coworkers 7, 8. It is not only a major subject in polymer chemistry, but also an area of many recent fascinating developments.…”