Correlation of Electrical Conductivity and Thermal Decomposition of Phenolic Materials

摘要

Changes in the temperature dependence of the electrical conductivity associated with thermal decomposition of several phenolic materials have been measured to 600 exp 0 C in nitrogen and air environments. The materials were phenolic resins reinforced with chopped glass fabric. Thermal decomposition product data and mass loss data were obtained from mass spectroscopy and thermal gravimetric analysis. Results showed that peaks in the conductivity temperature dependence were associated with material decomposition and/or outgassing, and that the presence of oxygen accelerates decomposition above approx. 450 exp 0 C. In the region of ohmic conduction (electric fields less than or equal to 4 x 10 exp 3 V/cm), there was excellent correlation between thermal decomposition characteristics and the temperature dependent electrical properties. This correlation suggests that electrical conductivity can be used as a thermal analysis tool in characterizing phenolic materials. (ERA citation 08:041631)