Kinetic heterogeneity of epoxide oligomers

The relaxational properties of epoxide oligomers have been studied by pulsed NMR. The kinetic heterogeneity is associated either with phase separation or the presence of a wide fractional composition of the oligomeric system. Comparison of the results of pulsed NMR with those of viscometry and dielectric methods shows that a decisive contribution to the character of the temperature dependence of the relaxational parameters is made by the free volume of the system.