Reference

Chemical reactions between thiocarbamylsulfenamides and benzothiazylsulfenamides leading to cure synergism

Chemical reactions between thiocarbamylsulfenamides and benzothiazylsulfenamides leading to cure synergism. Krymowski, J. F.; Taylor, R. D. (Chem. Div., B. F. Goodrich, Brecksville, Ohio, USA). Rubber Chem. Technol., 50(4), 671-7 (English) 1977. CODEN: RCTEA4. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) Section cross-reference(s): 28 The reaction of Cure-rite 18 [N-(-morpholinylthio)-4-morpholinecarbothioamide] [13752-51-7], 2-(4-morpholinylthio)benzothiazole [102-77-2], and S, and synergistic vulcanization accelerator, at 142° gave new covalent compds. [4,4'-(thiocarbonyl)dimorpholine [1013-93-0], bis(4-morpholinethiocarbonyl) sulfide [725-33-7] and disulfide [729-46-4], 4,4'-dithiodimorpholine [103-34-4], benzothiazol-2-yl 4-morpholinedithiocarboxylate [10225-09-9] 2-(4-morpholinyldithio)benzothiazole [95-32-9]], most of which decompd. to ionic compds. The structure of these compds. and their rate of formation explain the scorch resistance, cure efficiency, and vulcanizate thermal stability obtained with this accelerator combination.

Structural characterization of aged natural rubber gum vulcanizates by using thiocarbamylsulfenamide-dibenzothiazyl disulfide accelerator system

Structural characterization of aged natural rubber gum vulcanizates by using thiocarbamylsulfenamide-dibenzothiazyl disulfide accelerator system. Das, M. M.; Datta, R. N.; Basu, D. K.; Chaudhuri, A. K. (Dep. Macromol., Indian Assoc. Cultiv. Sci., Calcutta 700032, India). Kautsch. Gummi, Kunstst., 38(2), 113-15 (English) 1985. CODEN: KGUKAC. ISSN: 0022-9520. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The use of 1-[(4-morpholinethiocarbonamido)thio]piperidine [13752-51-7] and benzothiazyl disulfide [120-78-5] accelerators gave natural rubber vulcanizates with good aging and heat resistance with resp. to modulus and tensile strength. The crosslink d. of the vulcanizates increased markedly during aging. Substantial amts. of monosulfenic linkages were detected in aged vulcanizates at an early stage, although absent even at optimum cure at 140°. Combined S remained almost const. during aging, suggesting formation of other groups at the expense of polysulfenic linkages.