Analysis of Plastics by ATR FT-IR Spectroscopy.
Contents
1. ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12B INSTRUCTOR S CORLETT Analysis of Plastics by ATR FT IR Spectroscopy Reading For background on this technique see the following websites http www nuance northwestern edu KeckII ftir2 asp http en wikipedia org wiki Attenuated_total_reflectance http las perkinelmer com content TechnicalInfo TCH_ FTIRATR pdf For reference to the manual on our ATR sample cell made by Pike Technologies see the ATR manual at the school website entitled M RacleATR User Manual at http www laney edu wp corlett chemistry 12b spectroscopy Introduction Attenuated Total Reflectance Fourier transform infrared spectroscopy ATR FT IR is a special technique used for obtaining IR spectra of solids and liquids The essential feature of this technique is that samples are placed in contact with a special material called an internal reflection element or IRE and as the IR signal is reflected many times through the material some of it is absorbed by the sample see diagram below The absorption and corresponding wavelengths are recorded by the detector Sometimes the spectrum is viewed in absorbance A mode rather than in transmittance T normal FT IR which is also called transmission IR The key advantage to this technique is that the sample only needs to make good contact with the IRE and doesn t require the use of NaCl plates mixing with KBr or Nujol or any solvents The analysis of solids such as pla2. ormation in your prelab then deduce refute or verify the type of plastic Version 20101026
3. stics is straightforward and only needs to be clean and small enough to fit over the sample area sample Ti T C a 2 a 2 ie ATR FTIR i A Incident nse reflected infrared infrared light IRE light to detector E f 4 transmission FTIR Ma Ni 4000 3500 3000 2500 2000 1500 1000 Wavenumber em Procedure You will be instructed on how to analyze samples of plastic using the ATR sample cell instrument during laboratory Please bring samples of different plastics to analyze Possible samples include plastic bags of all sorts hard plastics such as in heavy duty water bottles soft flexible plastics PVC tubing etc The item may need to be cut or shaped by breaking to fit the sample cell Obtain the ATR FT IR of your sample and corresponding peaktable Version 20101026 ORGANIC CHEMISTRY LANEY COLLEGE CHEM 12B INSTRUCTOR S CORLETT Prelab and Exercise Find the structure of the following common plastic polymers PVC Nylon polyethylene polypropylene polycarbonate polyurethane polystyrene cellophane and natural rubber Your structure should show the repeating unit Predict the characteristic stretching frequencies that should be observed in the IR for each of the functional groups found in these polymers Note this information in your laboratory notebook it does not need to be turned in To Complete the Experiment Partial Report Identify the key absorptions for your sample and compare with the inf
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