Abstract
Thermally stable polymers were studied using thermogravimetry (TG) to 1400°C in helium. The heterocyclics were a polybenzimidazole and a polyimide. The aromatics consisted of two phenol formaldehydes, a phenylphenol phenol formal dehyde, and two polyphenylenes. Computer code analysis provided rate parameters for an Arrhenius type correlation. The rate parameters represented well the TG run. Overall pyrolysis mechanisms were examined in terms of rate parameters and computer code curves, which normalized out the polymer char yield and reinforcing fiber content. Standardization was emphasized to provide quality TG data and accurate parameters relatively free from procedural variables of polymer synthesis, degree of cure, sample preparation, thermobalance operation, data analysis, and pyrolysis beyond 1000°C.
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