COMPARATIVE INVESTIGATIONS OF THE CROSS-L INK DENSITY OF ELASTOMERS

Crosslink density or intercrosslink chain density of natural rubber vu lcanizates with and without carbon black can be obtained by means of t he H-1-NMR transversal relaxation, the analysis of uniaxial stress-str ain measurements, the investigation of swelling properties and, in spe cial cases of peroxide cured samples, by calculation. It is the object ive of the present study to compare the results obtained with these te chniques in order to find out the limits and possibilities. Therefore, several vulcanization systems with different types and concentrations of carbon black were investigated. Altogether, the results provide a consistent picture of network characteristics.