【摘要】 本工作采用三乙酰基丙酮钒及二乙酰基氧钒同烷基铝组成的催化体系,研究了乙炔聚合的规律及聚乙炔成膜的条件,并初步研究了聚乙炔膜的链节结构、形态结构及室温电导率。更多还原

【Abstract】 Acetylene monomer was polymerized with vanadium based catalyst to form free standing film of polyacetylene (PA). The effect of polymerization conditions including catalyst concentration, aging time of catalyst, polymerization solvent and temperature on morphology, catalytic activity and cis content has been investigated. It is shown that the catalytic activity of catalyst system containing VO (acac)2 is higher than that of V (acac)3. The suitable conditions for preparing PA film: molar ratio Al/V of 4-6; concentration of vanadium compounds >0.4 mole/1. When tetrahydrofuran and n-butyl ether were used as polymerization solvent, PA power was formed. The cis content of PA film depends upon the polymerization temperature, but is not higher than 70%.The room temperature conductivity of the PA film doped with I, is in the range of 10-102Ω-1·cm-1, similar to that prepared with Ti(OBu)4-AlR3. The conductivity of PA film obtained with catalyst system composed of V4+ was higher than that of V3+ catalyst. The observation by a scanning electron microscope showed that the film is composed of an accumlation of fibrils with diameter of 1000 A. The bulk density is about 0.8g/cm3.更多还原