US EPA

600083 

Journal Article 

Study of the ozonolysis rate constants' dependence from the degree of oxidation of C-60 fullerene and trans-1,4-polychloroprene 

Anachkov, MP; Cataldo, F; Deneva, MG; Rakovski, SK 

2007 

15 

3 

181-193 

10.1080/15363830701236373 

The changes in the current values of the reaction rate constants during the C-60 fullerene and polychloroprene ozonolysis in solution have been investigated. The reaction has been conducted in a bubble reactor and the respective k values were determined on the basis of continuous measurement of the ozone concentration in the gas phase at the reactor outlet, under conditions of constant values of the ozone concentration at the reactor inlet. An effect of decrease in the current values of the rate constant during the conversion of the respective double bonds has been observed. It has been determined that the decrease Of C-60 fullerene k values in the 0-70% region of conversions is about 56%. In the case of polychloroprene the reduction is 18% and 24% at degree of conversion of 70% and 90% correspondingly. The mechanism of these effects and their influence on the rate constants dependences on the degree of conversion of the respective sp(2) C-C bonds have been considered. A supposition about the dominant role of the chemical factors on reduction of the current k values of the C-60 fullerene and polychloroprene has been substantiated.