Identification of Antioxidants, Accelerators and Plasticizers in Rubber Compounds by Column Chromatography and Ultraviolet and Infrared Spectrophotometry

Abstract

This paper deals with separation of antioxidants, accelerators, and plasticizers in rubber compounds by column chromatography. The chromatographic diagrams obtained by a special ultraviolet detector and the spectra of the various fractions obtained from the extracts of eleven compounds are reported. With suitable reference samples, many other antioxidants and some other accelerators can be identified in addition to those tested in the present work. The identification of the components of the extract is improved examining the fractions also by IR spectrophotometry, employing either the technique of NaCl plates or, better, that of KBr pellets. Other very useful auxiliary techniques are paper and thin layer chromatography and gas chromatography.