Dear Fatima,
A very commonly used epoxy resin is DGEBA-based. I would suggest to look for the aromatic signals on the FTIR spectra. Very likely you will find those. If not, then epoxy may be aliphatic in nature, i.e. HDDGE.
Another aspect is to see how was the epoxy cured. A very high chance is that epoxy is either amine-cured or anhydride-cured. Then you should look for signals that can come from these compounds.
Overall, the best way to identify the polymer would be to compare your spectrum with the IR spectrum from the database and to see for which compounds you get the best fits.
Best Regards,
Andrey
in addition to Andrey E. Krauklis answer, you should pre-treat the spectra before discussing them. eg: baseline subtract, normalization and then you will see the difference between them. it seems that carbonyl and N-H or OH groups are present in your sample.
Andrey E. Krauklis answer is right. In addition, you'd best to give a more wide wavenumber region, e.g. 4000-400 cm-1 or 4000-600 cm-1. The aborbance bands in fingerprints region is very helpful to make a correct evaluation.
Thank you all, attached is the FTIR for the low region. I noticed the characterstic epoxy bond disappears as the sample cures. anything else that is to be reported?
Also, the band at 3300 which im guessing is from O-H (pic attached in first post) seems to become broad, can anybody explain why?
This is an amine cured epoxy.
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