PET samples with several additives and plain resin have been mixed for a specific time. During the mixing period the composition/decomposition was measured in the integrated slit capillary. When the mixture was ready it was transferred to micro injection molding machine in order to prepare disc shaped test specimens. With these discs rheological tests were performed afterwards on a rotational rheometer of the polymer melt. A correlation of the chain breaking, extension and cross linking effect of the additives in the results of the micro compounder and rheological tests is discussed.
