We are trying to measure degree of conversion of resin composite under ceramic restoration using FTIR. The specimens are flat and are cured next to a cellophane strip, so they are smooth and relatively flat. However, since we are just interested in the aliphatic and aromatic peaks at 1638 and 1608 in the spectral data, even after being flat and in close contact with the ATR crystal, we do not get any signal.
Would you think of anything we might be doing wrong?
We tried crushing the resin composite specimens and using the powder, we still had no luck.
Any idea that might help us I look forward to your reply.
Thank you.
May be the device didn't work.
If it is applicable try another FTIR device
We did, but it we had the same issue. One thing that work predictably was to crush the composite to small particles.
Yes, may be this is the point.
For degree of conversion test the sample should be very thin, the disc you did may be not thin enough
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