Structural analysis of crosslinking junctions of vulcanized natural rubber by field gradient fast magic angle spinning solid-state NMR spectroscopy

摘要

Solid state NMR spectroscopy by the field gradient-fast magic angle spinning (FG-MAS) technique is a nuclear resonance method developed for detailed analysis of structure in soft materials like rubber that have relatively active molecular motion [1]. Since FG-MAS uses fast magic angle spinning to eliminate the effect of dipole-dipole interaction without the sample having to be diluted with a deuterated solvent, and allows coherence selection using field gradients, academia and industry alike have looked forward to the development of wide-ranging applications. In particular, whereas two-dimensional NMR had hitherto been limited to samples in solution in deuterated solvents or solid samples such as crystals and glasses, FG-FMAS solid NMR spectroscopy has attracted attention as a revolutionary means of enabling two-dimensional NMR measurements on rubber, neither a liquid nor a solid.