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

Nuclear magnetic resonance spectroscopy is a technique useful for structure elucidation of organic compounds. C-13-NMR appears to be extraordinarily 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 standards are not necessary; the method does not require the removal of the filler from the compound. The purpose of this paper is to discuss how with a conventional solution NMR is possible to obtain spectral resolution appropriate for the analysis of solid samples of some crosslinked elastomers (CR, EPDM, BIIR, NBR).