Abstract
The curing behavior of an epoxy-phenolic coating containing a thermoplastic additive and iron oxide is described. Cure response was measured on a DuPont 981 Dynamic Mechanical Analyzer (DMA) and a Perkin-Elmer TGS-2 Thermogravimetric Analyzer (TGA). Samples coated onto a glass fiber ribbon were cured isothermally in the DMA, allowed to cool, and then scanned to measure the glass transition and related phenomena. During cure the thermoplastic additive was observed to phase separate, as evidenced by a secondary damping peak near its glass transition temperature. Above 200° oxidative reactions made a major contribution to the crosslink density. Isothermal TG in air and nitrogen showed evidence for oxygen uptake and an oxidative weight loss at temperatures >200°. Iron oxide, oxygen content of the purge gas, and flow rate of the purge gas were observed to affect cure behavior.
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