3-DIMENSIONAL POLYCONDENSATION OF MONOMERS WITH IONOMER-TYPE INTERACTIONS

The three-dimensional polycondensation of bifunctional hexamethylene d iamine and trifunctional guanidine hydrochloride is studied. It is sho wn that the properties of this process do not follow the classical Flo ry theory. One of the most interesting features is the dependence of t he critical extent of the polycondensation (i.e. the gel point) on the synthesis temperature. It is supposed that the reason for this is the different reactivity of the functional groups of guanidine hydrochlor ide and the different temperature coefficient of reactivity. As a resu lt, some parts of the functional groups are excluded from the reaction . It is supposed that the reason for this is the ionomer character of the guanidinium links in the linear chains. Due to dipole-dipole inter actions the ion pairs associated with the third functionality of these links aggregate into multiplets. Thus, reaction groups turn out to be effectively sterically screened and their ability to enter into the r eaction with the formation of branching points becomes restricted.