I'm trying to understand what can it causes the peaks in my sample to change. I'm measuring a mixture containing PUR, some additives, crosslinking agents and silicone. From time to time, the peaks corresponding to the silicone change in intensity. Assuming that the temperature is the same, as the composition, what can be the cause for these variations?
Mr. Pereira,
The IR-profile depends on set of molecular and environmental factors. You could pay attention to many monographs available to the topic of your question.
are you using same sample to record spectra? change in intensity depends on many factors.
First run a standard to decide if the change was in the instrument or the chemistry. Then continue to investigate the change. Contamination, methods, equipment malfunctions, temperature, pressure, and humidity are some of the causes. Also there might be a chemical reaction.
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