30 / 2015-04-22 21:37:44

Thermal decomposition characteristics of polymers applied in gelcasting of metal powders analysis with DSC/TG/FTIR/MS

Gelcasting, Polymers, Thermal decomposition, DSC, TG, FTIR, MS

The thermal decomposition characteristics of polymers containing aluminum-copper powders prepared by gelcasting were studied. The synthesized polymers played the role of binder in the shaping of aluminum-copper mixed powders by gelcasting method. Thermal decomposition of polymers synthetized by 2-hydroxyethyl methacrylate and diethylene glycol diacrylate in air and argon both present a three-stage process, but the mass loss in air was not accelerated significantly. The thermal decomposition mechanism under argon was evaluated by differential scanning calorimetry and thermogravimetry instrument coupled with fourier transform infrared and mass spectrometer. Under argon, the emissions of CO2, CO, NO2, H2O, hydrocarbon, alcohol and acetone were identified during the thermal decomposition. During pyrolysis, degradation of lower alkanol and polyols, random chain scission, depolymerization, decrosslinking of the network polymers and rupture of the homopolymer bonds dominated the stages. These measurements promoted to establish the optimum drying, burning out and sintering process, enabling the preparation of the sintered body without any defects.