Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=FTIR-Spektroskopie}} {{PSM_Infobox}} FTIR spectroscopy FORCETOC ==Fundamentals of FTIR spectroscopy== FTIR spectroscopy (often just called IR spectroscopy) is one of the most important methods for the identification and structure elucidation of plastics. It belongs to the methods of molecular spectroscopy. Infrared light in the wavelength range from 2.5 to 25 μm cau..."

2025-12-02T08:37:21Z

Created page with "{{Language_sel|LANG=ger|ARTIKEL=FTIR-Spektroskopie}} {{PSM_Infobox}} <span style="font-size:1.2em;font-weight:bold;">FTIR spectroscopy</span> __FORCETOC__ ==Fundamentals of FTIR spectroscopy== FTIR spectroscopy (often just called IR spectroscopy) is one of the most important methods for the identification and structure elucidation of plastics. It belongs to the methods of molecular spectroscopy. Infrared light in the wavelength range from 2.5 to 25 μm cau..."

New page

{{Language_sel|LANG=ger|ARTIKEL=FTIR-Spektroskopie}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">FTIR spectroscopy</span>
__FORCETOC__

==Fundamentals of FTIR spectroscopy==

FTIR spectroscopy (often just called IR spectroscopy) is one of the most important methods for the identification and structure elucidation of [[Plastics|plastics]]. It belongs to the methods of molecular spectroscopy. Infrared light in the wavelength range from 2.5 to 25 μm causes the molecules of the plastic to vibrate forcibly. Part of the emitted radiation is absorbed by the molecules, the remaining part of the radiation passes through the examined plastic unhindered.

The absorption bands appearing in the IR spectra are assigned to the vibrations of individual atomic groups (functional groups). Qualitative and quantitative analysis using IR spectroscopy is based on the wavelength-dependent interaction between IR radiation and molecules. Based on this interaction, absorption spectra with characteristic bands are generated.

==Possible applications of FTIR spectroscopy==

FTIR spectroscopy is thus used for material identification, the detection of atypical foreign substances on or in [[Plastics|plastics]] and the detection of [[Ageing|ageing]] and degradation processes. However, certain bond types, tacticity and [[Crystallinity|crystallinity]] can also be determined; plasticisers and additives can be detected in the spectra too.

The evaluation of the recorded IR spectra is carried out using already known comparison or sample spectra of known reference materials, which are available in extensive "infrared libraries" in books or in commercially available software. In plastics testing, especially plastics diagnostics and failure analysis, FTIR spectroscopy is a proven tool to determine possible deviations of the [[Plastics|plastic]] of a damaged part from regularly used (required) plastic types (reference materials).

==See also==

*[[Frequency Analysis | Frequency analysis]]
*[[Thermogravimetric Analysis (TGA)|Thermogravimetric analysis (TGA)]]
*[[Crystallinity]]

'''References'''

* DIN 53742 (1971-09): Testing of Plastics – Determination of the Vinyl Acetate Content of Copolymers of Vinyl Chloride and Vinyl Acetate – Infrared Spectrographic Method (withdrawn)
* Trempler, J.: Infrared Spectroscopy. In: [[Grellmann,_Wolfgang|Grellmann, W.]], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser Munich (2022) 3. Edition, pp. 325–327 (ISBN 978-1-56990-806-8; E-Book ISBN: 878-1-56990-807-5; see [[AMK-Büchersammlung | AMK-Library]] under A 22)
* Hellerich, W., Harsch, G., Baur, E.: Werkstoff-Führer Kunststoffe. Carl Hanser Verlag, München Wien (2010) 10. Auflage (ISBN 978-3-446-42436-4; see [[AMK-Büchersammlung | AMK-Library]] under G 37)

[[Category:Thermoanalytical Methods]]

FTIR Spectroscopy - Revision history