Abstract
The infra-red spectra of thirty one polyamides of different structures have been examined. The spectral changes which occur on iodine sorption in iodine—potassium iodide solutions and the accompanying changes on iodine desorption with sodium thiosulphate solution have been studied. The spectral observations have been analysed in relation to the changes in the polymer structures. Results show that polyamides of similar structural types, i.e. ‘even-even’, ‘odd-odd’, etc., usually conform to a given pattern of behaviour. It is concluded from the spectral evidence that iodine is involved in complex formation with polyamides as the tri-iodide ion.
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