TEMPERATURE-DEPENDENCE OF THE PROTON NMR-SPECTRA OF BITUMEN

The temperature dependence of the proton NMR spectra of bitumen sample s of different origin and quality has been measured between 400 K and 80 K. Whereas the linewidths of different samples are essentially iden tical above 340 K and below 240 K, there is a significant difference i n the linewidth transition region around room temperature. The results show that it is possible to discriminate between bitumen samples of d ifferent composition and quality by simply measuring the proton NMR li newidth at room temperature.