The Infrared Spectroscopic Identification of Rubber before and after Cure to the Soft and Hard Rubber States

The IR-spectroscopic identification of soft rubbers may be made by : 1. Breaking down the vulcanizate on a mill followed by boiling with o-dichlorobenzene and then the spectroscopic examination of the polymer recovered from the solution. 2. Thermal degradation of the vulcanizates followed by spectroscopic examination of the liquid and gaseous products of pyrolysis. The rubber base of hard rubbers is determined by spectroscopic examination of the materials obtained by thermal degradation of mixtures of the hard rubbers with zinc dust or powdered calcium.