Vibrational spectroscopy (Infrared, Near Infrared and Raman) has been widely used for the identification and characterization of polymers.
Infrared spectra of polymers give insight into structures at molecular level as into orientations and conformations of polymer chains.
Today, there is an increasing interest in investigating the dynamic properties of polymer films using infrared spectroscopy; the external perturbation of great interest is imposing a repeatable dynamic strain on the polymer. The dynamic difference IR spectra thus obtained can provide information as to the re-orientations and the conformational changes of the polymers.
FT-IR spectroscopy is very established for the quality control of industrially manufactured polymers. A change in the characteristic pattern of its absorption bands clearly indicates the change in a product or its contamination. If a bad spot in a product was found by visible inspection, its origin is typically determined by FT-IR microanalysis as this technique is capable to analyze the chemical composition of even very small areas on the surface.
FT-IR microanalysis as well as Raman analysis are further used in polymers to reveal the chemical structure of multilayered laminates.