AbstractFluorine‐19 NMR is used to examine the role of boron trifluoride monoethylamine (BF3–MEA) in epoxy resin cure. Spectra were first recorded in a variety of solvents suitable for dissolving different epoxy resins. All spectra contained a peak due to fluoroboric acid. Spectra of BF3–MEA in orthodichlorobenzene were then recorded at elevated temperatures. The floroboric acid peak area increased, indicating that the BF3–MEA was being hydrolyzed. Results indicate that, at temperatures above 100°C, BF3–MEA is completely hydrolyzed within 5 min to fluoro
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