| Popis: |
Fourier Transform Infrared Spectroscopy (FT-IR) has already been used for determining many characteristics of polymers. We have combined several different techniques, which were used independently of each other on the FT-IR, to determine the glass transition temperature of polymeric films. Recently a microprocessor temperature programmer has been interfaced to our Nicolet 7199 FT-IR spectrometer. This allows us to easily follow chemical reactions by infrared as a function of temperature. Changes in the infrared spectrum as the sample goes through phase transitions can be easily detected. The samples of interest in this study are epoxy polymers cured onto fiberglass fabric. The samples are approximately 200μ thick. Infrared characterization of these samples had been obtained using variable angle ATR. In order to determine the glass transition temperature of these polymeric materials, our ATR accessory was modified so that the polymer sample could be heated while ATR spectra were being obtained. The experimental details and results from this study are presented. |
