Abstract
The crystals of diethylenetriamine copper(II) sulfate complex (flame retardant) denoted as DETA-CuSO4 have been obtained by direct interaction of solid copper(II) sulfate pentahydrate with diethylenetriamine – DETA (hardener of epoxy resins) and characterized by means of X-ray powder diffraction, infrared spectra (IR) and thermal gravimetric analysis (TGA). The results of TGA reveal that the thermal degradation of DETA-CuSO4 takes place at 290°С, while the maximal temperature of combustion gaseous products amounts to 520°С. DETA-CuSO4 has been used as flame retardant in epoxy-amine polymers (DGEBA/DETA). The thermal behavior and combustibility of modified epoxy-amine composites (DGEBA/DETA-CuSO4) have been investigated using TGA, method of “ceramic tube” (CT) as well as measurement of ignition point and self-ignition point. TGA data confirms that adding DETA-CuSO4 to DGEBA (bisphenol A diglycidyl ether) appreciably improve the thermic stability and anti-flammability of DGEBA/DETA-CuSO4, mainly, owing to chemically interlinking incombustible inorganic salt of copper(II) sulfate with polymeric framework of DGEBA/DETA. Results of CT measurement show that the maximal combustion temperature of gaseous products for DGEBA/DETA in comparison with DGEBA/DETA-CuSO4 goes down from 867°C to 640°C and weight loss decreases from 89.0wt% to 78.6wt%.
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