ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Elementary sulfur which is educed as a result of the reaction between disulfides, peroxides, and H2S does not cause the vulcanization of rubber. Vulcanization as a process of chemical crosslinking formation occurs when this reaction proceeds with radicals formation (light effect, redox systems). Disulfides and sulfenamides cause the effect of vulcanization passing through the stage of hydrogen separation from α-methylene group, and the formation of polymer radicals. Vulcanizing agent groups join rubber during this process. This is confirmed by isotope exchange of vulcanizate. Conjugated reaction of the linking of sulfur and accelerator to rubber occurs in the presence of mercaptobenzothiazol and sulfur. Intermediate combinations of MBT and sulfur are educed. Monotonous drop of the ability of vulcanizate to exchange with elementary sulfur shows the importance of persulfhydril and polysulfide radicals in reactions of vulcanization.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1958.1203012128
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