Abstract
Crosslinking points of rubber vulcanizates have been investigated by nuclear magnetic resonance (NMR) spectroscopy. Several signals in 13C-NMR spectrum appearing after vulcanization of the rubber were assigned by solution-, solid- and latex-states 13C-NMR spectroscopy. The assignments of the signals, which have been reported by recent research works, are summarized in this article, and they are compared with each other to propose the most probable crosslinking points. The signals at 44ppm and 57ppm for natural rubber vulcanizates are rationally assigned to secondary, tertiary and quaternary carbons.
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