Infrared Spectroscopy (FTIR)
FTIR is a potent analytical technique with broad applications including material identification, monitoring chemical reactions, and observing physical processes like leaching/stratification/diffusion.
Example FTIR Analyses How it works: The bonds in chemicals oscillate at resonant frequencies. When inbound light matches that vibrational frequency it is absorbed. This creates peaks in the infrared absorption spectrum. Peak positions can be used to characterize which functional groups and types of molecules are present in the material. Spectral interpretation is aided via comparison against a 100k+ spectra library of polymers / resins / chemicals. Strengths:
Limitations:
Example FTIR Analyses Sampling Techniques and Specimen Size Requirements:
|
|
Relevant Methods:
- ASTM E1252 - Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis
- ASTM E168 - Standard Practices for General Techniques of Infrared Quantitative Analysis
- ASTM D276 - Standard Test Methods for Identification of Fibers in Textiles
- ASTM F2102 - Standard Guide for Evaluating the Extent of Oxidation in Polyethylene Fabricated Forms Intended for Surgical Implants
- ASTM D7414 - Standard Test Method for Condition Monitoring of Oxidation in In-Service Petroleum and Hydrocarbon Based Lubricants by FTIR