Vulcanization of ENBH (C9H14), a model for ENB containing EPDM rubber, with a system consisting of zinc oxide, stearic acid, sulfur, TMTD, and MBT at 140°C for 1 h yields slightly more than 30 different crosslinked products C9H13-Sn-C9H13 where n=2,3,4, and 5. In all of the products, the original ENBH structure is maintained (no shift of the double bond) and attachment of the sulfur bridge occurs only at the two allylic positions 3 and 9. Monosulfides (n=1) are probably also formed but no structures could be determined. Only small amounts of the MBT-Sn-C9H13 coupling products and noncrosslinked cyclic sulfides are formed.
Abstract. This paper is a review of 1D-and 2D-NMR studies on polyamides in solution. This review includes the effects of the choice of solvent on NMR spectra, possibilities of sequence analysis in co-and terpolyamides using either 'H-or "C-NMR spectroscopy, discrimination between polyamide blends and copolyamides, and observation of cyclic polyamide species in a linear polyamide matrix.
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