Hello,
I am actually working on the Degree of Conversion of dental resin composites in my lab.
When I perform my FTIR analyses, I apply the equation to calculate the DC (the equation is not wrong, I have already checked that) and I always obtain some values turning around 6% for the best polymerized resin. However my curves appear to be good and the peaks are the same than everybody in the literature (1608cm-1 and 1638cm-1).
You can find in the attached file an example of the curves (red non polymerized, blue polymerized). Sorry if the legend is not in the good order.
Did anybody already have such a problem with the calculations and do you know how to change it ?
Thank you so much
Best regards
Dear Thibault Canceill, which mode of FTIR you are using (transmission, ATR, ...)? Do the spectra are at the same base line? The papers I checked give conversions above 30%! Please check the following documents. My Regards
https://www.researchgate.net/publication/276510832_A_Critical_Review_on_the_Conversion_Degree_of_Resin_Monomers_by_Direct_Analyses
https://www.researchgate.net/publication/23670093_Infrared_spectroscopy_A_tool_for_determination_of_the_degree_of_conversion_in_dental_composites
Thank you for your answer and those of other persons by e-mail.
We have found a solution, if it can be utile to someone : We have openned the .ASC files in the software "Peak Spectroscopy Software", then performed a automatic peak detection in the interest zones and finally used the "Corrected peak Height" column.
Thank you for your help again
Thibault
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