A THERMAL-DEGRADATION COMPARATIVE-STUDY OF POLYESTERURETHANE BASED ON4,4'-DIPHENYLMETHANE DIISOCYANATE INTERACTED WITH D-BLOCK METALLIC CATIONS

A thermal degradation study of polyesterurethane based on 4,4'-dipheny lmethane di-isocyanate interacted with ''d''-block cations is presente d. Studies were made of the influence of both the atomic number Z in t he 3d series (Cr3+, Fe3+, Co2+ and Cu2+) and of the principal quantum number n = 3, 4 and 5 (Cu2+, Ag+, Au3+). For the relationship between the activation energy and the reacted fraction, an analytical equation that we proposed in a previous publication was verified. The physical parameter z/r, calculated using Slatter's rules, gives semi-quantita tive information on the thermal behavior of these compounds.