Crosslink yields in conventional and dynamic vulcanizates

Sulfur cured conventional vulcanizates from EPDM and the disperse elastomer phase of dynamic vulcanizates from PP and EPDM were compared with regard t o their network parameters. Measurements of swelling, stress-strain and NMR -relaxation were carried out to characterize the molar mass of the inter-cr osslink chains. The methods used result in mean parameters which are signif icant for the comparison of the network parameters of conventional and dyna mic vulcanizates. The investigation of the mechanical relaxation behavior f or samples with different crosslink degrees shows the specific influence of the crosslink content for conventional and dynamic vulcanizates.