A. B. Siqueira

Preparação e caracterização de poliuretanos contendo diferentes quantidades de óleo de baru

The baru oil (OB) is a renewable raw material from the brazilian cerrado, with high unsaturation percentage. The objective of this work was the study of polyurethane foam with different quantities of baru saponified oil. FTIR spectrum showed the bands of polyol, baru oil and prepolymer. The TG-DSC curves in N2 and air indicated different profiles, especially the formation of more stable intermediate products on the oxidation of these materials in air atmosphere. The quantity of heat obtained by DSC curves and the weight loss obtained by TG curve, indicates an OB saturation at 24.00% (w/w). The study by FTIR of the volatile products released by TG-DSC were water, CO2, CO and etanol. With the increase of OB, higher water absorption of PU, in 29.00% (w/w) of swelling index 91.10% for 1440 minutes. From these results, we observe the formation of polyurethane with different characteristics because of OB presence.

Synthesis, characterization and thermal behaviour of solid 2-methoxycinnamylidenepyruvate of some bivalent metal ions in CO2 and N2 atmospheres

.Solid State M-2-MeO-CP compounds, where M stands for bivalent metals (Mn, Fe, Co, Ni, Cu and Zn) and 2-MeO-CP is 2-methoxycinnamylidenepyruvate, were synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO and N atmospheres. The results were consistent with the general formula: M(L) ·H O. In 2 2 2 2