DETERMINATION OF THE COMPOSITION OF ETHYLENE-PROPYLENE-RUBBERS USING C-13-NMR SPECTROSCOPY

A detailed C-13-NMR procedure has been developed to analyze ethylene-p ropylene-rubbers (EPM). Special attention has been paid to instrumenta l and spectral parameters and calculation methods. By applying this pr ocedure, it is possible to obtain consistent and reproducible molecula r composition results on EPM, independent of the measuring laboratory and the calculation method. The procedure has been tested in eight ind ustrial laboratories. Using this procedure, the composition of a set o f 10 EPM standards has been defined. These standards will be used for worldwide infrared calibration purposes (ASTM D-3900). (C) 1995 John W iley & Sons, Inc.