Temperature anomalies of DEA–CuCl4 and TEA–CoCl2Br2/PMMA nanocomposites

Phase transitions were studied for the new synthesized ferroic (NH2(C2H5)2CuCl4 (DEA–CuCl4) and (NH2(C2H5)4CoCl2Br2 (TEA–CoCl2Br2) nanocrystallites (NC) incorporated into polymer matrices. Comparison with the bulk crystals is performed. A giant temperature shift (from 305.1°C to 360.3°C) of onset temperature for TEA–CoCl2Br2 nanoparticles after their incorporation into the PMMA matrix was found and is substantially larger compared to the DEA–CuCl4. The DSC analysis shows that the temperature of phase transition is crucially dependent on the thermocycling and temperature rate. The principal role of the nano-sized effects is shown.