Magnetoabsorption Techniques For Measuring Material Properties. Part II: Measurement of Residual and Applied Stress.
Final rept. Jan 66-Oct 67,
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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The thermal degradation of several polyimidazopyrrolone pyrrone films was studied in air and in vacuum over the range of 100-1000 deg C. by thermogravimetric analysis TGA, with the use of both isothermal heating and programmed heating rates of 2,3,5, and 7.5 deg C.min. At pressures of 10-6 torr or less, maximum weight losses average 30 at 800 deg C. Rates of volatilization and activation energies were derived to provide comparison between these ladder-type polymers. Mass spectrometric analysis of the pyrolysis gases evolved under vacuum conditions showed that CO, CO2, and H20 were the primary volatile products and that they were formed throughout the period of weight loss. The ability of these materials to absorb readily 5-7 wt.- of water under ambient conditions and the effect of this property upon weight loss measurements are shown. Author, modified-PL.
- Metallurgy and Metallography