Structural Analysis of Crosslinking Junctions of Vulcanized Natural Rubber by Solid-state NMR Spectroscopy Equipped with Field-gradient-magic Angle Spinning Probe

摘要

Field gradient-fast-magic angle spinning (FG-FMAS) probe, developed for solid-state NMR spectroscopy, was applied to investigate crosslinking junctions of vulcanized natural rubber. Resolution of ~1H- and ~(13)C-NMR spectra and correlation between ~1H and ~(13)C of the vulcanized natural rubber were investigated. Signals, appearing between 40 and 60 ppm, were well assigned by FG-FMAS-NMR spectroscopy. Based on the assignments of the signals, origin of outstanding mechanical properties of the vulcanized natural rubber was found to be due partly to the structure of crosslinking junctions.