Abstract
Thermo-oxidative degradation of epoxy resin cured with polyamideamine (Epikote 828 / Tohmide 225=50w / 50w) was studied using a simultaneous analytical system combining thermogravimetry (TG) -differential thermal analysis (DTA) -Fourier transform infrared spectroscopy (FTIR).
The resin used in this study was cured for 60 days at a room temperature, post-cured for 30 minutes at 100°C and finely ground to the size of 60 mesh pass. About 5 mg of a sample was loaded in a Pt-cell for TG-DAT analysis, and heated under the dry air at the flow rate of 100 cc/min.
The result was as follows : In the thermo-oxidative degradation process, the total gas profile obtained by FTIR was similar to the DTA- and DTG- time curves, and the evolved gases were mainly water vapor and carbon dioxide. In the first stage of thermo-oxidative degradation, there were a few organic acids, ammonia, and carbon monoxide, detected by FTIR. Thus, it was confirmed that the simultaneous TG-DTA-FTIR system was very useful for the analysis of the thermo-oxidative degradation process and gases evolved on heating the cured epoxy resin.
