Analysis of Cured, Filled Elastomeric Compounds by 13C NMR

Abstract

Abstract This paper has discussed the study of cured, filled elastomers by a newly developed 13 C NMR method. This method overcomes many of the shortcomings of other methods in that the 13 C method is capable of distinguishing nonstandard or experimental polymeric components in an elastomeric blend, a definite advantage for the analyst. Other advantages are that the 13 C data are primary, i.e. , compositional calibration standards are not necessary once a polymer's 13 C carbon resonances have been assigned; the data are accurate and reproducible; the filler (carbon black, TiO 2 , glass fibers) does not have to be removed prior to the analysis; and, the method is sensitive to low levels of polymer concentration. The superiority of 13 C quantitative data over IR data has been demonstrated. Practical examples including nonstandard and/or unique elastomeric components have been discussed.