Study of hydrocarbon‐soluble organometallic catalysts. I. Correlations between catalytic activity and electric conductivity of Al(C2H5)3–Ti(OC4H9)4 catalysts in the synthesis of stereoregular polyacetylene

Publisher Website
Google Scholar
Abstract
The correlation between the catalytic activity of the system Al(C2H5)3–Ti(OC4H9)4 and its electrical conductivity in stereospecific polymerization was investigated. The activity of the catalyst was evaluated for varying molar ratios of Al/Ti (in the range of 0.75–6) and reaction temperatures (in the range of −78 to +70°C.) by means of the velocity of absorption of the acetylene. The ionic state of the catalytic complex may be assessed on the basis of electrical conductivity measurements. The electrical conductivity of the pure state of the two catalyst components is in the range of 10−12 or 10−10 (ohm‐cm.)−1 while that for the catalyst complex is of the order of 10−8 (ohm‐cm.)−1. The experimental data prove the existence of a correlation between the velocity of reaction, the composition of the catalyst complex, and the electrical conductivity. The values obtained for the activation energy of the electrical conductivity correlate with the energy required to break the complex ion aggregate of the catalyst and therefore with the activity of the catalyst.

This publication has 1 reference indexed in Scilit: