Polimerización radicálica del cianoacrilato de n-butilo

Abstract

The kinetic study of the radical polymerization of butyl cyanoacrylate was carried out by dilatometry. The values of reaction rate pseudoconstant (k) for the radical polymerization reaction of this monomer were obtained using a new method for processing experimental data, named exponential fit method. In this method, the h f(t) values (h is equivalent to the liquid height in the capillary
dilatometer) are fitted to an exponential function. This procedure allowed to determine the reaction rate constant without knowing the ho and h¥ values. The method was previously tested through the study of radical polymerization of methyl metacrylate. The determined values of rate reaction pseudoconstant (k) for methyl metacrylate were compared with those calculated from other well known methods: integral and Guggenheim methods. An additional comparison for methyl metacrylate was carried out between the obtained values and those calculated from reported data. The order with regards to initiator concentration and k value were determined by the radical polymerization of butyl cyanoacrylate using two different methods for processing the experimental measures in the case of k value. The obtained results for butyl cyanoacrylate shows the normal behavior of a radical polymerization
reaction: the first order with regards to the monomer and the ½ order with respect to initiator. The authors can conclude that exponential fit method is equivalent to the employment of the Guggenheim method fitting the h f(t) values to an exponential function.