Synthesis of Highly Conducting Polyacetylene Thin Films

概要

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Preparative condition of a Ti(O-n-Bu)_4-A1Et_3 catalyst and polymerization methods were investigated for synthesis of highly conducting polyacetylene films. One of the most important factors is thermal aging of the catalyst. Those films prepared by a catalyst aged over 80℃ have good stretchability, high bulk density and high electrical conductivity. On the contrary, those films synthesized by a catalyst aged at room temperature below 80℃ are porous and not stretchable. An aging at 150℃ for 5 minutes is enough to produce a stretchable highly conducting film. Composition of the catalyst system is also an important factor determining properties of the films. Concentration of catalyst is another key factor governing stretchability and other properties of films. The nonsolvent method gives very stretchable film superior to those prepared by the solution method. Even a thin free-standing film of a few μm could be stretched by 6 times. After doping by iodine, a maximum conductivity of 30,000 S/cm along orientation direction is obtained. The solution method produced less stretchable thin film. A moderate stretching of 3 times gives a conductivity of 24,000 S/cm owing to its high intrinsic conductivity of 6,000 S/cm before elongation.
理論物理学刊行会の論文
1993-10-20