for example in my work, i should produce nanofiber mat via in situ polymerization (addition polymerization). i use several material as carrier in electrospinning. now, i produce nanofiber but i dont know how much polymer exist in my nanofiber? :-(
what can i do for calculate polymerization yield?
my polymer not dissolve in any solvent.
so i synthesise pure polymer and collect its FTIR spectra. i know that N-H peak is specific peak for my polymer that not react with other components. can i calculate height of this peak in pure polymer(H) and nanofiber(h), then report h/H ratio as percent of polymer in my nanofiber?
Sorry but the description is not clear enough. Electrospinning requires polymer solution. The monomer itself will not produce nanofiber. Please describe in some more detail your procedure. Usually quantitative IR requires calibration by known standards. If relative changes are enough you may use the internal standard method.
Recently, we developed the new method to solve this issue for that you have to weight some more time. The paper is not yet published.
This is excellent, Mr Nagarajan. But can you tell me, my manner is true or false? nothing else, just tell true or false?
I normalize spectra and select baseline by omnic software. then compare peak height in pure sample and my sample.
is peak height in my sample/peak height in pure sample ratio give precent of pure sample in my sample?
Semi-quantitative FTIR analysis may be possible by comparing the sample spectra with that of better known reference samples in a normalized absorbance scale. Quantitative FTIR analysis may be possible by the internal standard method (absorbance scale).
Dr. Carlos Araújo Queiroz, quantitative analysis is also possible with FTIR.
Dr.Elham Tavakkol, That is partially right, you should compare the peak area that will be more accurate, but before that, there are many factors to consider. The polymer is amorphous or semi-crystalline. If it is semi-crystalline then you have to select the peak which should not affect by the crystallization. You should select the two independent peaks one is from polymer and another from nanofiber.
Please see this paper it will be useful to you for to quantify using FTIR.
Just accepted in Polymer
Synthesis and characterization of cellulose nanocrystal-graft-Poly(d-lactide) and its nanocomposite with Poly(l-lactide). DOI: 10.1016/j.polymer.2016.09.070
- Badges
- Science topic