In Fourier Transform Infrared (FTIR) spectroscopy at Rocky Mountain Labs, polymer film chemical composition is identified and foreign materials on or within film layers analyzed. From barrier and packaging layers to protective films and industrial membranes, FTIR analysis provides a quick, non-destructive means of verifying material identity, examining surface modifications, and identifying contamination that could affect performance or quality.
Why Use FTIR for Film Analysis
Polymer films are generally made from materials like polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), nylon, and specialty multilayer laminates. Each material has its own infrared absorption signature depending upon its molecular structure. FTIR spectroscopy detects these absorption bands, allowing precise determination of the polymer or polymers in a film.
Besides identifying the base material, FTIR can identify additives, surface coatings, or contaminants that might have been added during production, handling, or application. This makes it especially valuable in quality control, material verification, and troubleshoot situations.
Applications of FTIR Film Analysis
At Rocky Mountain Labs, FTIR film analysis serves a multitude of applications:
- Identification of base polymers, especially for unidentified or proprietary films.
- Detection of contaminants, for example, foreign fibers, residues, or particulate matter trapped in or deposited on the film surface.
- Analyzing multilayer structures, aiding in isolating and characterizing individual film layers when feasible.
- Examination of adhesion failure or surface alteration connected to bonding, coating, or lamination.
Film specimens are normally examined intact by ATR-FTIR, which enables direct chemical analysis of the surface with minimal sample preparation. Cross-sections or peeled layers can be prepared in multilayer films for focused analysis.
Sampling and Analytical Considerations
We mostly employ Attenuated Total Reflectance (ATR) FTIR for film identification, which is suitable for identification at the surface and detection of impurities. For multilayered films or composite materials, we might suggest mechanical or chemical separation of the layers (if possible) for separate analysis.
FTIR analysis is most effective with organic and polymer materials and is not as effective in detecting inorganic filler or metal-based substances, which can be better tested with supplementary methods such as SEM/EDS.
Scope and Limitations
FTIR does not provide mechanical or barrier property data, but it does offer essential insight into chemical identity and integrity. While highly useful for film manufacturers and end-users alike, it’s important to note that Rocky Mountain Labs does not perform FTIR analysis for environmental, forensic, geological, or biomolecular samples. Our work with food and pharmaceutical films is strictly limited to foreign material detection or contaminant identification.
FTIR spectroscopy is a proven and effective technique for polymer film analysis, confirming material content, and identifying surface-level contamination. From resolving product variations to incoming material inspection or film performance troubleshooting, Rocky Mountain Labs offers reliable FTIR analysis to suit your specific requirements in industrial and commercial film applications.
