Fourier Transform Infrared Analysis of Varnish Curing Kinetics
ATR-FTIR cure kinetics tracking links acrylate double bond conversion percentages directly to monomer migration safety and substrate blocking performance.
ATR-FTIR Analysis
Molecular Spectroscopic Method
Attenuated total reflection Fourier transform infrared spectroscopy identifies chemical functional groups by measuring the interaction between infrared light and a sample surface. This instrument uses a high refractive index crystal to create an evanescent wave that penetrates the material contact area. Detection occurs when the sample absorbs specific frequencies of light, producing a spectrum that represents the chemical bonds within the molecular structure of the substrate.
The technique identifies organic binders and additives on paper or plastic surfaces without requiring destructive sample preparation.
Surface Interface Measurement
Precise contact between the prism and the sample remains the primary condition for accurate data acquisition. Flat materials such as polymer films or coated boards ensure optimal signal intensity through uniform pressure across the crystal interface. Irregular surfaces necessitate higher force or specialized contact tools to avoid signal loss from air gaps between the substrate and the internal reflection element.
Small quantities of sample material suffice for this detection since the analysis probes only the top few micrometers of the surface.
Chemical Identity Verification
Analytical results provide the baseline for confirming the composition of coatings or identifying unknown contaminants on a production substrate. Analysts compare the resulting peak patterns against libraries to distinguish synthetic resins from natural polymers in adhesive or barrier applications. Identification happens within minutes, allowing for immediate process adjustments during coating or lamination stages.
Spectral data quantifies the consistency of material layers to ensure adherence to specified chemical tolerances in industrial paper and board converting.