|Structural Characterization of Crosslinking Points of Rubber Vulcanizates
Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan
Nippon Gomu Kyokaishi,(2006),79(10),487-493 General Review in Japanese
Crosslinking points of rubber vulcanizates have been investigated by nuclear magnetic resonance (NMR) spectroscopy. Several signals in C-NMR spectrum appearing after vulcanization of the rubber were assigned by solution-, solid- and latex-states C-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 44 ppm and 57 ppm for natural rubber vulcanizates are rationally assigned to secondary, tertiary and quaternary carbons.
Rubber Vulcanizates, Crosslinking Points, NMR