IDENTIFICATION OF ELASTOMERS IN VULCANIZED COMPOUNDS BY C-13-NMR SPECTROSCOPY

Nuclear magnetic resonance spectroscopy is a technique useful for stru cture elucidation of organic compounds. C-13-NMR appears to be extraor dinarily advantageous for structure identification of cured and filled elastomeric compounds. Once the carbon resonance assignments are made in the C-13-spectrum of a polymer, compositional calibration standard s are not necessary; the method does not require the removal of the fi ller from the compound. The purpose of this paper is to discuss how wi th a conventional solution NMR is possible to obtain spectral resoluti on appropriate for the analysis of solid samples of some crosslinked e lastomers (CR, EPDM, BIIR, NBR).