IN-SITU INVESTIGATION OF SBR VULCANIZATION - A COMBINED STUDY OF H-1-NMR AND VULCAMETRY

For the first time, in situ NMR measurements were performed during sul fur vulcanization of unfilled SBR. A vulcanization device was construc ted for use in combination with a standard microimaging probe in a ver tical bore NMR magnet. H-1-linewidth measurements are correlated with cure simulations in a vulcameter to explain the increase of the linewi dth during the vulcanization. Inhomogeneous heating conditions in the sample result in an inhomogeneous course of the vulcanization as a fun ction of time. The spatial dependence of this process was monitored by NMR imaging.