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Thermogravimetric Analysis

TGA-FTIR is a valuable technique for identifying the volatiles evolved from materials heated in a flowing gas stream in a TGA furnace. The temperature range of our TGA furnace is 25-1200 C, and we typically operate with air or nitrogen atmospheres, although alternative atmospheres will be considered. Sample size for this experiment is typically about 25 milligrams for polymers.

Micro-Scan Services, Inc. uses an Analect Instruments Diamond 20 FT infrared spectrometer with the Laser Precision modular TGA interface. The TGA heater and balance is a DuPont model 950 operated by a controller and software of our own design. THe interface and transfer lines can be heated to 300 C to avoid condensation of evolved gases. Infrared spectra are taken at 1 second intervals during the heating program and stored on disk. The TGA weight loss vs. temperature curve from TGA controller is then plotted with an overlay plot of chosen infrared bands vs. temperature, or the entire set of infrared data can be plotted as a 3-D display.

APPLICATIONS

POLYMERS
TGA-IR can be used to determine the evolution of residual solvents, monomers, additives, depolymerization products, and in the study of flame-retardant materials, the relative ratios of fire-retardant materials to fuel species.
ELECTRONICS
Residual volatiles in PWB, evolved gases at processing temperatures, off-gassing by components and structural materials.
INORGANIC MATERIALS
Confirmation of small molecule loss such as H2O, NH3, CO2, CO, SO2, etc., from inorganic compounds, minerals, and ceramics. Composition of evolved materials from molded ceramic binders.
COMPOSITES
Identification of volatiles from composite resins during cure and post-cure heating cycles.
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