Conformal Coating Outgassing and the Difficult Identification Due to Product Thermal Rearrangement

Ray Fuentes, Curtis Mowry, Jessica Roman

Sandia National Laboratories

Outgassing is defined as the release of chemical species from a material, which is important for its performance and for its compatibility with other materials. The identification of 4-methyl-3-pentenoic acid was detected from conformal coating outgassing but is suspected of thermal rearrangement resulting in 2-methyl-2-pentenoic acid. This is the result of the analysis on GC/Tof/MS with an inlet temperature of 300 °C and oven ramp temperature from 40 °C to 240 °C. Studies have been performed to determine if the rearrangement of the compound is a result of inlet temperature or column temperature. To verify our theory, we used multiple mass spectrometers to inject headspace or liquid to bypass the hot inlet temperature and determine whether the thermal rearrangement was within the column or within the inlet. Altered oven ramp temperatures on the two instruments have been examined to verify at which temperature the rearrangement occurs. This poster will document scientific evidence that thermal rearrangement is possible when analyzing for 4-methyl-3-pentenoic acid and care must be taken so the measurement method doesn’t alter the analyte.

Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.