I have prepare polymer composite by using insitu polymerization. I have obtained the raw data for FTIR spectroscopy. Now, I am bit confuse how should i interpret it?
Dear all, all chemical groups (functional or not) their absorption bands are tabulated according to their modes of vibrations. However, since you are dealing with a composite material you will be lucky to get detailled structural information, shielding effect is really pronounced. Other modes of IR spectroscopie such as Raman and ATR are more powerfull in unvestigating hybrid materials. My Regards
You should obtain at least four spectra: 1) spectrum of pure reinforcement such as fiber or filler using Kir pellet method, 2) spectrum of pure unpolymerized resin using KBr plate method, 3) spectrum of polymerized resin on KBr plate, and finally 4) the spectrum of the composite ground and made into KBr pellet. The spectrum 1) and 3) will help you interpret the composite spectrum identifying each peak to the reinforcement and polymerized resin. I doubt that if you will see unique peak that are not either in the reinforcement or polymerized resin unless the reinforcing material is a nano filler. You can Google the spectrum of those pure materials to find band assignment. Chances are that you will be able to find the paper reporting the band assignment for the material, unless you are working on the material you synthesized and is the world supply.
Hatsuo Ishida Abdelkader BOUAZIZ Mina Karimi-Avargani Is the methodology of preparation may lead to the missing of some bands? or if we obtained we short peaks then what i interpret from the peaks?
Dear Maryam Mehrban,
Interpretation of FTIR spectra is very easy if you have a deep understanding of the presence of different functional groups inside the region of infrared that is most useful lies between 2.5-16 µm (4000-625 cm-1) and it depends on transitions between vibrational energy states:
Stretching: higher energy / higher wavenumber (cm-1)
Bending: lower energy / lower wavenumber (cm-1)
This can be achieved when you practice more and more on several student textbooks for such interpretation, besides reading many reputed published articles that include some details about the interpretation process.
I have attached some generally related files to help you for identifying the various functional groups.
In addition, I recommend you to design a comparison-figure for FTIR analysis between the obtained polymer and the other related compounds, e.g. the monomer before polymerization, the polymer after a differnt functional group, the nanoparticle that hosts the polymerization step (if present), the cargo included within the nanoparticle for the expected application (drug, protein, dye,...), etc. This will promote your work so much and will be interesting to the readership audience. Herein some examples of recently published papers containing the FTIR analysis with comparison-figures and nicely interpreted as well:
Article A facile design of smart silica nanocarriers via surface-ini...
Article Poly(DMAEMA-co-MPS) Coated Mesoporous Silica Nanoparticles a...
Article Grafting multi-walled carbon nanotubes (MWCNTs) into PIPD fi...
Article Improving the mechanical properties, UV and hydrothermal agi...
Article Synthesis and Evaluation of Titanium Oxide Modified Mussel I...
Article Gold Modified Polydopamine Coated Mesoporous Silica Nano-Str...
Article Synthesis and Evaluation of Water Soluble pH Sensitive Poly ...
Article Construction of Polymer Coated Core-Shell Magnetic Mesoporou...
Article Homo- and copolymerization of N-(2-thiazolyl)methacrylamide ...
Article Synthesis and Thermal Characteristics of N-(Thiazol-2-yl)met...
Best regards,
Dr. Hegazy
Hi
You need to keep in your mind the following things
) Wavenumber
) absorption or transmittance %
) Type of molecular vibration (stretch, bend or wag etc..)
) Keep IR molecular vibration chart. You can get it from Net
best
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