58. Compact low-field NMR spectroscopy and chemometrics: A tool box for quality control of raw rubber
This study reports experimental results from the analysis of 108 SBR samples by low-field 1H and 13C NMR spectroscopy at 1?T in combination with partial least square regression to develop methodology for quality control of raw rubber. The partial least square regression (PLS-R) models were developed for quantifying the individual monomer units present in the SBR which are impossible to quantify because of peak overlap in the SBR 1H NMR spectrum obtained at 1?T. The spectra revealed differences between samples from the same and different manufacturing batches of same and different manufacturers from different countries in a qualitative and quantitative fashion.