|Characterization of Modified Natural Rubber through NMR Spectroscopy
Chemicals Evaluation and Research Institute, Japan Sugito-machi, Kitakatsushika-gun, Saitama, Japan
Nippon Gomu Kyokaishi,(2009),82(10),450-456 General Review in Japanese
Characterization of modified natural rubber has been performed through 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. Recently, pulsed-field-gradient (PFG) technique made possible to observe a correlation between 1H and 13C in good signal to noise ratio in a short time. In fact, 2D NMR measurements with inverse pulse techniques provide a new insight into assignments of signals in NMR spectrum for epoxidized natural rubber, so that the signals are correctly assigned with various pulse sequences. Carbonated natural rubber, which is a novel functional organic material, is characterized through 2D NMR spectroscopy with various pulse techniques, in which no model compound is required for the assignments. Quantitative analysis for a reaction between epoxidized natural rubber and poly (L-lactide) is performed on the basis of the correct assignments of the signals in 1H NMR spectrum for epoxidized natural rubber. The assignments and related quantitative analysis will play an important role in a molecular design of the modified natural rubber.
Natural Rubber, Modified Natural Rubber, Characterization, NMR