Use of Curve Analysis to Analyze Overlapping Bands in the Infrared Spectra of Polymers
Derivative spectroscopy and Fourier self-deconvolution methods used to enhance the apparent resolution of spectra were applied to overlapped regions of the infrared spectra of three polymers: (i) the methylene rocking band of polyethylene in the 750 to 700 cm−1 range; (ii) polystyrene in the 600 to 500−1 cm range which is sensitive to the conformational structure; and (iii) an epoxy resin in the range 3200 to 2700 cm−1 where an absorption band relative to the epoxy group at 2984 cm−1 allows to study the curing reaction. Fourier self-deconvolution was found to give the best results to estimate peak positions and half-widths. The curve analysis of the different spectra was done using deconvolution results as starting values.
KeywordsCurve Analysis Epoxy Group Fourier Space High Frequency Side Fourth Derivative
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