Hello Rezvan Sharifi   

The spectrum is not very distinct which indicates a mixture of components.

I suggest a mixture of 2 carbonyl compounds. Probably an ester (.-C=O at ~1730 cm-1) However, the asymetrical C-O stretch at ~1280 cm-1 is very weak.

The band at ~1080 cm-1 (symetrical C-O stretch in an aster) is too strong for an ester but can also involve a C-O stretch from an alcohol (there is an O-H stretch at ~3450 cm-1.)

The second C=O peak (double peak?) at ~1800 cm-1 might come from a compound containing a halogen adjecant to the carbonyl which should raise the frequency due to the inductive effect from the electronegative group.

Have you tested the sample for the presence of chlorine?

Kind regards

Torbjörn Lindblom

Thank you dear Torbjon 

No, I did not do, the advice that I do? then what changes in the outcome?

Thanks a gain

In this respect, it may be an Bio polyester resins?

Dear Rezvan Sharifi

To determine if you have a chlorine in your sample I suggest the ”Beilstein test” which is very simple and cheep. You know how to perform it? https://en.wikipedia.org/wiki/Beilstein_test

I don´t think you have biopolymer if you suggest there is a peptide in your sample. The peaks at 1639 and 1552 cm-1 are missing (amide band I and II)

Can you send the original Omnic file to [email protected] ?

Kind regards

Torbjörn Lindblom

Dera Tobjorn , i sent it , with another IR spect. without  pyrolysis.

Thanks so much

Dera Tobjorn , i sent it , with another IR spect. without  pyrolysis. I will test halogen, it seems very easy, very polite.

Thanks so much

Dear Rezvan, how did you obtain the spectrum? Is it a liquid pyrolysis product and transmission spectrum or an ATR of a solid coating??  Regarding the automatic identification Troy CD1 is a  liquid  polymer ester additive Dispersion AYD8 is an alkyd resin. I fully agree with Torbjörn, that you system contains more components, and the associated OH band is especially strong. Can you perform  pyrolysis GC-MS? That could help a lot.  Are you interested in the volatile/liquid  components of  a system or in the solid/polymer component?

Mr. Sharifi,

Can you provide the data in ASCII format, because of as figure like the attached one here is difficult to evaluate the spectroscopic changes? Only about the C=O-region it is possible to distinguish the profile.

I send you all three curves I have. Pyrolysed without pirolizi...one was made by another laboratory!

Thanks a lot

I send you all three curves I have. Pyrolysed without pirolizi...one was made by another laboratory!

Thanks a lot

I send you all three curves I have. Pyrolysed without pirolizi...one was made by another laboratory!

Thanks a lot

I send you all three curves I have. Pyrolysed without pirolizi...one was made by another laboratory!

Thanks a lot

Dear Rezvan Sharifi

In order to help you further I suggest you make yourself more familiar with the Omnic software. (You will find instructions under Help/Getting started.)

-Assign the peaks in your spectrum with “Find peaks”

-Learn to split the spectrum at 2000 cm-1. (The fingerprint region will thus be expanded and easier to interpret.)

-Learn to save a spectrum  in a form that you can send to your colleges e.g. “Samplename”.JDX or .IRD for those with Omnic software

Also, if possible, I would like to have a spectrum of the pure polymer. (Which types of accessories do you have for your FT-IR?)

Kind regards

Torbjörn Lindblom

I send you FTIR result how to interpret the spectra

A more complete evaluation of the spectra obtained  from Rezvan Sharifi is found in the added file.

The conclusion is:

The sample analysed is some type of polyurethane. Best match with the library is a polyether urethane (for FT-IR chips) with a match of 61,5%  and monoelaidin 77.7% (for FT-IR Pirolisi) a di-alcohol. The sample has probably not been fully cured and contains unreacted isocyanate and polyol.

I´m looking forward to comments

Torbjörn Lindblom