Investigations of photopolymerization by means of intermittent illumination

An apparatus is described for intermittent illumination of the sample in a DSC-2C (Perkin-Elmer) modified with some additional optical equipment. A slotted disk is used as a light chopper. This is driven by a computer-controlled stepping motor. The various frequencies needed for investigations of this kind are derived from a computer quartz-controlled clock frequency by means of software. The operator dialogue is achieved through the Perkin-Elmer Data Station to simplify the use of the equipment.