Thermal Stability of Epoxy- Metallic Polyurea Complexes

In this work, thermal stability of epoxy resin blended with polyurea- metal complexes were investigated using (TGA) and compared with the non- blended polyurea complexes. It was found that the polyureas alone exhibit thermal stability between 250-310 C. The values of IDT decreased in the order PBU>POU> PPU>PTU, while the values of MDT is much closer to each other in the rang 335- 350 C. The differences between TGA thermograms appeared in polyurea complexes were approximately diminished in epoxy blend thermograms especially in the region 300-500 C. The complete decomposition temperature for the blends are more than 600 C whilest, this temperature not exceeds 400 C for epoxy resin alone. The average reference values IDT, MDT and (W%) 350 are 118 C, 386 C and 62% respectively for the untreated samples and raised to 180 C , 590 C and 86% respectively for (alkaline or acidic ) treated blends.