English Abstract |
Structural Characterization of Vulcanized Natural Rubber by Latex State 13C NMR Spectroscopy Jinta UKAWA Toyo Tire & Rubber, Co., Ltd, Ibaraki, Osaka, Japan, Seiichi KAWAHARA Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan Nippon Gomu Kyokaishi,(2006),79(12),562-566 General Review in Japanese Abstract Crosslinking point is one of important factors that govern mechanical properties of vulcanized elastomers. The method of how to characterize the crosslinking points through latex state 13C NMR spectroscopy was proposed for vulcanized NR instead of long standing solid state 13C NMR spectroscopy. Small signals at 44 ppm and 58 ppm in the aliphatic carbon region, which appeared after vulcanization, were assigned by Distortionless Enhancement by Polarization Transfer (DEPT) and Attached Proton Test (APT) to secondary, tertiary and quaternary carbons of crosslinking points, respectively. The latex state 13C NMR spectroscopy was proved to be indispensable to characterize the vulcanized NR. Keywords: Natural Rubber, Latex, Structural Characterization, NMR, Rubber Vulcanizate |
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